It would be very helpful if closings could be scheduled to repeat on a specific occurrence of a weekday each month (i.e. repeat closing each 2nd Saturday of every month). My use scenario here is a library that's only open the first Saturday of the month. Currently the fastest way to pull that off is a weekly repeated holiday on Saturday, and then manually placing exceptions each first Saturday which requires ongoing manual upkeep. Double bonus points if it could also limit to a specific month (i.e. repeat closing every 4th Thursday in November). Currently those "Unique" holidays have to be added at the start of each year despite their yearly repetition on a predictable schedule.
This would be a very helpful calendar feature and would save a lot of time setting "holidays" by hand!