Please note that this question is only for admin users

Yes, you as an admin user allow external attendees to do so during the global event setup.  

If this has been enabled, external attendees will have the flexibility to easily reschedule their meetings. They can do this from the meeting invites in their Outlook or Google calendars, email reminders, or even directly from the initial booking email by clicking on a link that offers alternative availability to meet at the global event.

This feature empowers external attendees to manage their schedules effectively, eliminating the need for back-and-forth communication when they need to reschedule a meeting.