+### avatar_lookup
+Called when looking up the avatar. `$b` is an array:
+
+- **size**: the size of the avatar that will be looked up
+- **email**: email to look up the avatar for
+- **url**: the (string) generated URL of the avatar
+
+### emailer_send_prepare
+Called from `Emailer::send()` before building the mime message.
+`$b` is an array of params to `Emailer::send()`.
+
+- **fromName**: name of the sender
+- **fromEmail**: email fo the sender
+- **replyTo**: replyTo address to direct responses
+- **toEmail**: destination email address
+- **messageSubject**: subject of the message
+- **htmlVersion**: html version of the message
+- **textVersion**: text only version of the message
+- **additionalMailHeader**: additions to the smtp mail header
+
+### emailer_send
+Called before calling PHP's `mail()`.
+`$b` is an array of params to `mail()`.
+
+- **to**
+- **subject**
+- **body**
+- **headers**
+
+### load_config
+Called during `App` initialization to allow addons to load their own configuration file(s) with `App::loadConfigFile()`.
+
+### nav_info
+Called after the navigational menu is build in `include/nav.php`.
+`$b` is an array containing `$nav` from `include/nav.php`.