There are many jokes in the Harry Potter books but is there any joke done as April's Fools Day joke?
Yes, there's a brief mention in Harry Potter and the Goblet of Fire. Apparently it's a known tradition in the Wizarding world.
‘No wonder they were glad to get shot of him at the Ministry, did you hear him telling Seamus what he did to that witch who shouted “boo” behind him on April Fools’ Day? And when are we supposed to read up on resisting the Imperius Curse with everything else we’ve got to do?’
HP and the Goblet of Fire - Chapter 15: Beauxbatons and Durmstrang
Moving down the canon, there was also a mention of an April Fool's Day prank in the Gamecube version of Harry Potter and the Chamber of Secrets.
Stinkitus is a magical disease provoked by breathing the noxious green gas left when one explodes a Stink Pellet. On April 1st, 1979, approximately five-hundred cases of Stinkitus were reported throughout London. This happened because 42-year old Caractacus Phelps dropped no less than eight hundred Stink Pellets from the roof of the Daily Prophet building in Diagon Alley.