I have a database of all the gigs I've ever played - all of them! - so it's easy to sort special dates that I've played. Mine are:
Birthday (Aug 18) - 18 gigs
Leap year Feb 29 - 5
July 4 - 13
Halloween gigs - 10
Christmas - 0
New Year's Eve - 19
How many of each type have you done?
I've had practices on kids' birthdays, and I've had a gig or two on anniversaries. My family is really cool though, my kids and my wife. None of them are hung up on dates. We celebrate when it's convenient and don't hold fast to specific days. We would rather pick out a day close to a birthday and spend the day celebrating as opposed to trying squeeze in cake and ice-cream on school days where homework and studying take place in addition to me coming home late from work etc.
Have a standing gig every St. Patrick's day at a local craft brewery, in a hipster neighborhood.
Played an out door private party/football watch party. Were were paid to play pregame festivities, between quarters, halftime, and a brief set (5 songs) after the game. All Food, beverage, and even a watch table were provided for us, humorous band tour T-shirts made for everyone there including us. Best of all, It was my alma mater (THE Ohio State University) playing and winning, and got paid well to do it!