Flexible date-based availability for Monthly calendar

I want to open availability for my Monthly (November) calendar the same way I do with Simple Practice, where I can select the dates I want and the timeframes. I cannot do this on Upheal, as I can only select a set day of the week with set hours, and I alternate Saturdays and Sundays every weekend.

Allow opening availability for the Monthly (November) calendar by selecting specific dates and timeframes, as with Simple Practice. Currently availability can only be set as a fixed day of the week with fixed hours, which does not work for alternating Saturdays and Sundays every weekend.