Well, our pirate household enjoyed Talk Like a Pirate Day. Pirate Boy was particularly good and only said "Shiver me timbers!" when he was on the playground and not in the classroom. It was one of our long and painful days, so I had to use the threat of keelhauling to get the little pirates to go to bed, but they didn't make me follow through.
After that, I turned to the most appropriate entertainment I could think of, and fired up the Pirates! game. It's got great atmosphere any old time. But do you know what it does on September 19?
It talks like a pirate, of course.