Hi Uncle Cheese,
just installed your great event calendar module and maybe i discovered a bug:
just tried to add an event that starts on friday, 20.nov and ends on sunday, 29.nov which is on fri, sat and sun.
added start date = 20.nov, end date 29.nov, weekly recurring event on weekdays sun, fri, sat.
It recovers mostly perfect, but last day (sun 29.nov) isn't repeated.
I use latest revisions (event calendar R83, DOM R313) and replicated this behaviour on your demo site (see advent market in basic calendar)
BTW: is it possible to add an recurring event with different start / end times, e.g one that runs on friday 15:00 - 20:00 and on sat/sun from 10:00 - 20:00 ??