Christine Jorgensen’s Birthday
Whether or not you mark this event is very dependent on your group. You could do a tip where all the men dance the girl’s part and the women dance the boy’s part. Or you could do a “Denmark” tip, where all the dancers change gender roles every time a gender-based call (like Star Thru or Slide Thru) is called. Or (easier) a tip where everybody changes roles at the end of every sequence.
If your club has transexual members, make sure they’re okay with this kind of playing around. No point in inadvertently offending anyone.