The iffy days I'm closed for are Easter Monday, Christmas Eve Day and Family Day but not Remembrance Day. I have a dcMom who works for the federal government and they don't get Family Day but they do get Remembrance Day. You can't please everyone so do what is best for you.
I started closing for the Christmas Eve Day because a family took advantage of me and kept their child here all day so they could finish their shopping. I have things to do and a family too! As long as it's listed in your contract parents can book the day off with their employer when they book their vacations. I haven't had any complaints from my clients.