Original post was 2004, it's 2012 now and still no recurring events.
I think it's time to fix that
There's other thread on this too, but I think this was the best one to bump since it shows how long people have wanted this feature for. Also, the mod mentioned in this thread does not work in SMF 2 so once again we are without any options for recurring events in calendar. It would be great to see this functionality added to the calendar included with SMF and indeed at this point it is a necessary feature for the calendar to be competitive with other software.