I'll find out if it is possible to get events in 'Registrants Management' to get displayed by (user) rules. Is there any effect with rules on Registrant Management? Version 1.6.9.
What do you mean by Rule ? If you want to config what user group can access to Registrants Management function, you can go to Events Booking -> Configuration, click on Options button in the toolbar, select the group you want to access to this function, set "Registrants Management" permission to Allowed