It was interesting to see what cons might do for that day of pranks.
Brasil Fur Fest did this

COME FOR HIGH DANCES AT THE BFF 2023 HELIPONTO!!! Feel like you’re on cloud nine at the first furry club on top of a hotel! If you don’t have vertigo, you can’t miss it! Come join this outdoor party with the light breeze that only the thirtieth floor can offer!
Meanwhile Indy Fur Con took a more fishy theme

Ahoy there, mateys! We are excited to make a bold new announcement! While once we were a place to celebrate all manner of creatures sky and land, we have decided to rebrand & focus our love on the creatures of the sea!
Therefore, iFC now stands for… IndyFishCon!