I used to do it this way and than I switched to part times paying every other stat and now everyone (pt and ft) pay for stats. Much easier!
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I have a separate sheet in my contract that parents sign that specifies the day and date of every paid holiday for my daycare(that includes stats and civic holidays). When a stat falls on a weekend, I pick an alternate weekday in place of the holiday. My parents pay for all of their regular weekdays, so if I change the stat to a monday, all regular monday attendees must pay.
This parent was a few days short on the notice period, and attends on fridays, where good friday falls, so I'm making them pay it, even if I'm closed, as it falls within the notice period.