Ability to set an end date

Ability to choose the repeat of every week, every two weeks or every month

When editing an appointment you have the ability to edit details or cancel just that one appointment or the entire recurring appointment series

You can change a single appointment to a series. (make one appointment recurring)

Clients cannot create recurring appointments - the reason for this is because, you may have Monday at 4:00 pm available for a recurring appointments but have a one-off Monday at 4:00 non-availability for a holiday closure appointment then the calendar would see that as not available for a recurring appointment, frustrating the client to find a time slot.