I was looking for this, and maybe it exists (and I haven't found it) or maybe it's a feature request.
When a new user is added, is it possible for them to get an invitation for all future events? Likewise, is it possible to send a cancellation notice when a user is unsubscribed?
I have a group that meets regularly, but which has changing membership. I can sort of fake this by creating a repeating meeting and sending a reminder a week in advance, but it would be really helpful (and less error prone) if the meeting invites were sent automatically.