Alestorm has a song (via NPR) nicely suited for the day:
Keelhaul that filthy landlubber, send him down to the depths below!
Make that bastard walk the plank, with a bottle of rum and a yo-ho-ho!
You can get your very own pirate name here. Here's mine:
Iron Bess Bonney
A pirate's life isn't easy; it takes a tough person. That's okay with you, though, since you a tough person. You can be a little bit unpredictable, but a pirate's life is far from full of certainties, so that fits in pretty well. Arr!
Don't know how to talk like a pirate? Avast, me hearty, there's hope! There is an instructional wiki, or here's an instructional video that can help you get into the spirit of the day:
Another way to get into the proper spirit is to read books with pirates in them. Treasure Island is online, as are Howard Pyle's Book of Pirates and The Pirates Own Book by Charles Ellms.
AllRecipes.com has pirate recipes. Wired has directions for making a pirate map from a paper sack.
Or you could watch the Mary Martin "Peter Pan":
part 2, part 3, part 4, part 5, part 6, part 7, part 8, part 9, part 10, part 11, part 12, part 13, part 14, part 15
There is a Facebook event page and several groups. This link is to the largest of the Facebook groups. For Pastafarians this is an important holiday.
Remember George Harrison? He could talk like a pirate before there was a holiday to celebrate it: