Index: signup.module
===================================================================
--- signup.module	(revision 102)
+++ signup.module	(working copy)
@@ -1351,6 +1351,9 @@
   // If we made it this far, we're going to need the full $user object.
   $user = user_load(array('uid' => $signup_form['uid']));
 
+  // Add the user information to the node object for future reference in the module_invoke_all
+  $node->signup_user = $user;
+
   if (user_access('sign up for content') && $node->signup_status) {
     // Grab the current time once, since we need it in a few places.
     $curtime = time();