diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 8e19bb1d7d..834f57a38b 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -2231,6 +2231,7 @@ function phpbb_on_page($template, $user, $base_url, $num_items, $per_page, $star
 function append_sid($url, $params = false, $is_amp = true, $session_id = false)
 {
 	global $_SID, $_EXTRA_URL, $phpbb_hook;
+	global $phpbb_dispatcher;
 
 	if ($params === '' || (is_array($params) && empty($params)))
 	{
@@ -2238,6 +2239,39 @@ function append_sid($url, $params = false, $is_amp = true, $session_id = false)
 		$params = false;
 	}
 
+	$append_sid_overwrite = false;
+
+	/**
+	* This event can either supplement or override the append_sid() function
+	*
+	* To override this function, the event must set $append_sid_overwrite to
+	* the new URL value, which will be returned following the event
+	*
+	* @event core.append_sid
+	* @var	string		url						The url the session id needs
+	*											to be appended to (can have
+	*											params)
+	* @var	mixed		params					String or array of additional
+	*											url parameters
+	* @var	bool		is_amp					Is url using & (true) or
+	*											& (false)
+	* @var	bool|string	session_id				Possibility to use a custom
+	*											session id (string) instead of
+	*											the global one (false)
+	* @var	bool|string	append_sid_overwrite	Overwrite function (string
+	*											URL) or not (false)
+	* @since 3.1-A1
+	*/
+	$vars = array('url', 'params', 'is_amp', 'session_id', 'append_sid_overwrite');
+	extract($phpbb_dispatcher->trigger_event('core.append_sid', compact($vars)));
+
+	if ($append_sid_overwrite)
+	{
+		return $append_sid_overwrite;
+	}
+
+	// The following hook remains for backwards compatibility, though use of
+	// the event above is preferred.
 	// Developers using the hook function need to globalise the $_SID and $_EXTRA_URL on their own and also handle it appropriately.
 	// They could mimic most of what is within this function
 	if (!empty($phpbb_hook) && $phpbb_hook->call_hook(__FUNCTION__, $url, $params, $is_amp, $session_id))
diff --git a/phpBB/includes/functions_content.php b/phpBB/includes/functions_content.php
index 6b2ee98d7a..e7772e14fe 100644
--- a/phpBB/includes/functions_content.php
+++ b/phpBB/includes/functions_content.php
@@ -411,13 +411,33 @@ function strip_bbcode(&$text, $uid = '')
 function generate_text_for_display($text, $uid, $bitfield, $flags)
 {
 	static $bbcode;
+	global $phpbb_dispatcher;
 
 	if (!$text)
 	{
 		return '';
 	}
 
-	$text = censor_text($text);
+	$censor_text = true;
+
+	/**
+	* Use this event to modify the text before it is parsed
+	*
+	* @event core.modify_text_for_display_before
+	* @var string	text			The text to parse
+	* @var string	uid				The BBCode UID
+	* @var string	bitfield		The BBCode Bitfield
+	* @var int		flags			The BBCode Flags
+	* @var bool		censor_text		Whether or not to apply word censors
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'uid', 'bitfield', 'flags', 'censor_text');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_display_before', compact($vars)));
+
+	if ($censor_text)
+	{		
+		$text = censor_text($text);
+	}
 
 	// Parse bbcode if bbcode uid stored and bbcode enabled
 	if ($uid && ($flags & OPTION_FLAG_BBCODE))
@@ -443,6 +463,19 @@ function generate_text_for_display($text, $uid, $bitfield, $flags)
 	$text = bbcode_nl2br($text);
 	$text = smiley_text($text, !($flags & OPTION_FLAG_SMILIES));
 
+	/**
+	* Use this event to modify the text after it is parsed
+	*
+	* @event core.modify_text_for_display_after
+	* @var string	text		The text to parse
+	* @var string	uid			The BBCode UID
+	* @var string	bitfield	The BBCode Bitfield
+	* @var int		flags		The BBCode Flags
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'uid', 'bitfield', 'flags');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_display_after', compact($vars)));
+
 	return $text;
 }
 
@@ -453,7 +486,23 @@ function generate_text_for_display($text, $uid, $bitfield, $flags)
 */
 function generate_text_for_storage(&$text, &$uid, &$bitfield, &$flags, $allow_bbcode = false, $allow_urls = false, $allow_smilies = false)
 {
-	global $phpbb_root_path, $phpEx;
+	global $phpbb_root_path, $phpEx, $phpbb_dispatcher;
+
+	/**
+	* Use this event to modify the text before it is prepared for storage
+	*
+	* @event core.modify_text_for_storage_before
+	* @var string	text			The text to parse
+	* @var string	uid				The BBCode UID
+	* @var string	bitfield		The BBCode Bitfield
+	* @var int		flags			The BBCode Flags
+	* @var bool		allow_bbcode	Whether or not to parse BBCode
+	* @var bool		allow_urls		Whether or not to parse URLs
+	* @var bool		allow_smilies	Whether or not to parse Smilies
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'uid', 'bitfield', 'flags', 'allow_bbcode', 'allow_urls', 'allow_smilies');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_storage_before', compact($vars)));
 
 	$uid = $bitfield = '';
 	$flags = (($allow_bbcode) ? OPTION_FLAG_BBCODE : 0) + (($allow_smilies) ? OPTION_FLAG_SMILIES : 0) + (($allow_urls) ? OPTION_FLAG_LINKS : 0);
@@ -482,6 +531,19 @@ function generate_text_for_storage(&$text, &$uid, &$bitfield, &$flags, $allow_bb
 
 	$bitfield = $message_parser->bbcode_bitfield;
 
+	/**
+	* Use this event to modify the text after it is prepared for storage
+	*
+	* @event core.modify_text_for_storage_after
+	* @var string	text			The text to parse
+	* @var string	uid				The BBCode UID
+	* @var string	bitfield		The BBCode Bitfield
+	* @var int		flags			The BBCode Flags
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'uid', 'bitfield', 'flags');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_storage_after', compact($vars)));
+
 	return;
 }
 
@@ -491,10 +553,33 @@ function generate_text_for_storage(&$text, &$uid, &$bitfield, &$flags, $allow_bb
 */
 function generate_text_for_edit($text, $uid, $flags)
 {
-	global $phpbb_root_path, $phpEx;
+	global $phpbb_root_path, $phpEx, $phpbb_dispatcher;
+
+	/**
+	* Use this event to modify the text before it is decoded for editing
+	*
+	* @event core.modify_text_for_edit_before
+	* @var string	text			The text to parse
+	* @var string	uid				The BBCode UID
+	* @var int		flags			The BBCode Flags
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'uid', 'flags');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_edit_before', compact($vars)));
 
 	decode_message($text, $uid);
 
+	/**
+	* Use this event to modify the text after it is decoded for editing
+	*
+	* @event core.modify_text_for_edit_after
+	* @var string	text			The text to parse
+	* @var int		flags			The BBCode Flags
+	* @since 3.1-A1
+	*/
+	$vars = array('text', 'flags');
+	extract($phpbb_dispatcher->trigger_event('core.modify_text_for_edit_after', compact($vars)));
+
 	return array(
 		'allow_bbcode'	=> ($flags & OPTION_FLAG_BBCODE) ? 1 : 0,
 		'allow_smilies'	=> ($flags & OPTION_FLAG_SMILIES) ? 1 : 0,
@@ -1175,6 +1260,7 @@ function truncate_string($string, $max_length = 60, $max_store_length = 255, $al
 function get_username_string($mode, $user_id, $username, $username_colour = '', $guest_username = false, $custom_profile_url = false)
 {
 	static $_profile_cache;
+	global $phpbb_dispatcher;
 
 	// We cache some common variables we need within this function
 	if (empty($_profile_cache))
@@ -1252,10 +1338,34 @@ function get_username_string($mode, $user_id, $username, $username_colour = '',
 
 	if (($mode == 'full' && !$profile_url) || $mode == 'no_profile')
 	{
-		return str_replace(array('{USERNAME_COLOUR}', '{USERNAME}'), array($username_colour, $username), (!$username_colour) ? $_profile_cache['tpl_noprofile'] : $_profile_cache['tpl_noprofile_colour']);
+		$username_string = str_replace(array('{USERNAME_COLOUR}', '{USERNAME}'), array($username_colour, $username), (!$username_colour) ? $_profile_cache['tpl_noprofile'] : $_profile_cache['tpl_noprofile_colour']);
 	}
+	else
+	{
+		$username_string = str_replace(array('{PROFILE_URL}', '{USERNAME_COLOUR}', '{USERNAME}'), array($profile_url, $username_colour, $username), (!$username_colour) ? $_profile_cache['tpl_profile'] : $_profile_cache['tpl_profile_colour']);
+	}
+	
+	/**
+	* Use this event to change the output of get_username_string()
+	*
+	* @event core.modify_username_string
+	* @var string mode				profile|username|colour|full|no_profile
+	* @var int user_id				String or array of additional url
+	*								parameters
+	* @var string username			The user's username
+	* @var string username_colour	The user's colour
+	* @var string guest_username	Optional parameter to specify the
+	*								guest username.
+	* @var string custom_profile_url Optional parameter to specify a
+	*								profile url.
+	* @var string username_string	The string that has been generated
+	* @var array _profile_cache		Array of original return templates
+	* @since 3.1-A1
+	*/
+	$vars = array('mode', 'user_id', 'username', 'username_colour', 'guest_username', 'custom_profile_url', 'username_string', '_profile_cache');
+	extract($phpbb_dispatcher->trigger_event('core.modify_username_string', compact($vars)));
 
-	return str_replace(array('{PROFILE_URL}', '{USERNAME_COLOUR}', '{USERNAME}'), array($profile_url, $username_colour, $username), (!$username_colour) ? $_profile_cache['tpl_profile'] : $_profile_cache['tpl_profile_colour']);
+	return $username_string;
 }
 
 /**
diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index 9e33a5122e..f843902dd5 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -162,6 +162,7 @@ function user_update_name($old_name, $new_name)
 function user_add($user_row, $cp_data = false)
 {
 	global $db, $user, $auth, $config, $phpbb_root_path, $phpEx;
+	global $phpbb_dispatcher;
 
 	if (empty($user_row['username']) || !isset($user_row['group_id']) || !isset($user_row['user_email']) || !isset($user_row['user_type']))
 	{
@@ -255,6 +256,16 @@ function user_add($user_row, $cp_data = false)
 		}
 	}
 
+	/**
+	* Use this event to modify the values to be inserted when a user is added
+	*
+	* @event core.user_add_modify_data
+	* @var array	sql_ary		Array of data to be inserted when a user is added
+	* @since 3.1-A1
+	*/
+	$vars = array('sql_ary');
+	extract($phpbb_dispatcher->trigger_event('core.user_add_modify_data', compact($vars)));
+
 	$sql = 'INSERT INTO ' . USERS_TABLE . ' ' . $db->sql_build_array('INSERT', $sql_ary);
 	$db->sql_query($sql);
 
diff --git a/phpBB/posting.php b/phpBB/posting.php
index 736ba8feea..2d3cb9ab44 100644
--- a/phpBB/posting.php
+++ b/phpBB/posting.php
@@ -44,6 +44,41 @@ $mode		= ($delete && !$preview && !$refresh && $submit) ? 'delete' : request_var
 $error = $post_data = array();
 $current_time = time();
 
+/**
+* This event allows you to alter the above parameters, such as submit and mode
+* 
+* Note: $refresh must be true to retain previously submitted form data.
+*
+* Note: The template class will not work properly until $user->setup() is
+* called, and it has not been called yet. Extensions requiring template
+* assignments should use an event that comes later in this file.
+*
+* @event core.modify_posting_parameters
+* @var	int		post_id		ID of the post
+* @var	int		topic_id	ID of the topic
+* @var	int		forum_id	ID of the forum
+* @var	int		draft_id	ID of the draft
+* @var	int		lastclick	Timestamp of when the form was last loaded
+* @var	bool	submit		Whether or not the form has been submitted
+* @var	bool	preview		Whether or not the post is being previewed
+* @var	bool	save		Whether or not a draft is being saved
+* @var	bool	load		Whether or not a draft is being loaded
+* @var	bool	delete		Whether or not the post is being deleted
+* @var	bool	cancel		Whether or not to cancel the form (returns to
+*							viewtopic or viewforum depending on if the user
+*							is posting a new topic or editing a post)
+* @var	bool	refresh		Whether or not to retain previously submitted data
+* @var	string	mode		What action to take if the form has been sumitted
+*							post|reply|quote|edit|delete|bump|smilies|popup
+* @var	array	error		Any error strings; a non-empty array aborts
+*							form submission.
+*							NOTE: Should be actual language strings, NOT
+*							language keys.
+* @since 3.1-A1
+*/
+$vars = array('post_id', 'topic_id', 'forum_id', 'draft_id', 'lastclick', 'submit', 'preview', 'save', 'load', 'delete', 'cancel', 'refresh', 'mode', 'error');
+extract($phpbb_dispatcher->trigger_event('core.modify_posting_parameters', compact($vars)));
+
 // Was cancel pressed? If so then redirect to the appropriate page
 if ($cancel || ($current_time - $lastclick < 2 && $submit))
 {
@@ -1417,6 +1452,14 @@ $template->assign_vars(array(
 	'S_HIDDEN_FIELDS'		=> $s_hidden_fields)
 );
 
+/**
+* This event allows you to modify template variables for the posting screen
+*
+* @event core.posting_modify_template_vars
+* @since 3.1-A1
+*/
+$phpbb_dispatcher->trigger_event('core.posting_modify_template_vars');
+
 // Build custom bbcodes array
 display_custom_bbcodes();
 
diff --git a/tests/session/append_sid_test.php b/tests/session/append_sid_test.php
index 88f6f0718e..34f6dea8ca 100644
--- a/tests/session/append_sid_test.php
+++ b/tests/session/append_sid_test.php
@@ -45,6 +45,9 @@ class phpbb_session_append_sid_test extends phpbb_test_case
 	*/
 	public function test_append_sid($url, $params, $is_amp, $session_id, $expected, $description)
 	{
+		global $phpbb_dispatcher;
+
+		$phpbb_dispatcher = new phpbb_mock_event_dispatcher;
 		$this->assertEquals($expected, append_sid($url, $params, $is_amp, $session_id));
 	}
 }