Hola Daniel,
http://docs.moodle.org/dev/Events_API, aquí tienes una lista de eventos que lanza moodle 2.x:
./admin/uploaduser.php: events_trigger('user_updated', $existinguser);
./admin/uploaduser.php: events_trigger('user_created', $user);
./auth/email/auth.php: events_trigger('user_created', $user);
./auth/ldap/auth.php: events_trigger('user_created', $user);
./cohort/lib.php: events_trigger('cohort_added', $cohort);
./cohort/lib.php: events_trigger('cohort_updated', $cohort);
./cohort/lib.php: events_trigger('cohort_deleted', $cohort);
./cohort/lib.php: events_trigger('cohort_member_added', (object)array('cohortid'=>$cohortid, 'userid'=>$userid));
./cohort/lib.php: events_trigger('cohort_member_removed', (object)array('cohortid'=>$cohortid, 'userid'=>$userid));
./course/lib.php: events_trigger('course_category_deleted', $category);
./course/lib.php: events_trigger('course_category_deleted', $category);
./course/lib.php: events_trigger('course_created', $course);
./course/lib.php: events_trigger('course_updated', $course);
./course/mod.php: events_trigger('mod_deleted', $eventdata);
./course/modedit.php: events_trigger('mod_updated', $eventdata);
./course/modedit.php: events_trigger('mod_created', $eventdata);
./enrol/manual/locallib.php: events_trigger('user_unenrol_modified', $enrolment);
./group/lib.php: events_trigger('groups_member_added', $eventdata);
./group/lib.php: events_trigger('groups_member_removed', $eventdata);
./group/lib.php: events_trigger('groups_group_created', $group);
./group/lib.php: events_trigger('groups_grouping_created', $data);
./group/lib.php: events_trigger('groups_group_updated', $group);
./group/lib.php: events_trigger('groups_grouping_updated', $data);
./group/lib.php: events_trigger('groups_group_deleted', $group);
./group/lib.php: events_trigger('groups_grouping_deleted', $grouping);
./group/lib.php: events_trigger('groups_members_removed', $eventdata);
./group/lib.php: events_trigger('groups_groupings_groups_removed', $courseid);
./group/lib.php: events_trigger('groups_groups_deleted', $courseid);
./group/lib.php: events_trigger('groups_groupings_deleted', $courseid);
./lib/accesslib.php: events_trigger('role_assigned', $ra);
./lib/accesslib.php: events_trigger('role_unassigned', $ra);
./lib/accesslib.php: events_trigger('role_unassigned', $ra);
./lib/enrollib.php: events_trigger('user_enrolled', $ue);
./lib/enrollib.php: events_trigger('user_unenrol_modified', $ue);
./lib/enrollib.php: events_trigger('user_unenrolled', $ue);
./lib/enrollib.php: events_trigger('user_unenrolled', $ue);
./lib/eventslib.php:function events_trigger($eventname, $eventdata) {
./lib/moodlelib.php: events_trigger('user_logout', $params);
./lib/moodlelib.php: events_trigger('user_created', $DB->get_record('user', array('id'=>$user->id)));
./lib/moodlelib.php: events_trigger('user_updated', $DB->get_record('user', array('id'=>$oldinfo->id)));
./lib/moodlelib.php: events_trigger('user_deleted', $user);
./lib/moodlelib.php: events_trigger('course_deleted', $course);
./lib/moodlelib.php: events_trigger('course_content_removed', $course);
./lib/portfolio/exporter.php: events_trigger('portfolio_send', $this->id);
./mod/assignment/type/upload/assignment.class.php: events_trigger('assessable_file_uploaded', $eventdata);
./mod/assignment/type/upload/assignment.class.php: events_trigger('assessable_files_done', $eventdata);
./mod/assignment/type/uploadsingle/assignment.class.php: events_trigger('assessable_file_uploaded', $eventdata);
./mod/quiz/attemptlib.php: events_trigger('quiz_attempt_submitted', $eventdata);
./mod/quiz/startattempt.php:events_trigger('quiz_attempt_started', $eventdata);
./user/edit.php: events_trigger('user_updated', $usernew);
./user/editadvanced.php: events_trigger('user_created', $usernew);
./user/editadvanced.php: events_trigger('user_updated', $usernew);
./user/emailupdate.php: events_trigger('user_updated', $user);
