This action runs when a Group Manager is assigned to a group.
do_action('pm_assign_group_manager_privilege',$gid,$user_id);
Simple example
function ProfileGrid_assign_group_manager($gid,$user_id) { //do something with the user id and Group ID when a Group Manager is assigned to a group. } add_action('pm_assign_group_manager_privilege','ProfileGrid_assign_group_manager');