At this moment it's not possible to reschedule an event or live class. You need to cancel the booking, add a new time slot, and then people need to book themselves on the new time slot manually (auto-enrol function does not work). This is a very time consuming and painful process and it also allows for people 'forgetting', as auto-enrol doesn't work. It would be great if we can reschedule the existing time slot with all its existing attendees.