At the S.C.A's annual Pensic War one of the camps is a Pirate Ship, called the Ravenspittle. Another camp, St. Gabriel's is all pseudo nuns.
The Mother Superior tried very hard to make the pirates change their wicked ways. Finally, she warned them that if they didn't give up their life of crime a monster would come out of the sea and attack the ship. Sure enough, that night, a Giant Squid came up from the road outside the camp, and attacked the Ravenspittle. It takes 15 people to be a giant squid, 3 for the body and 12 for the tentacles.
It occurs to me that another game we used to play in the Society would work at a Pirate party. Border Raid. Males line up on one side of the field, females ont he other. At the word Go, men run across the field, try to grab a woman, and carry her back to the finish line. First couple across wins.
Now my friend Fred celebrated his 50th birthday with a pirate party, and sliced the cake with a cutlass. But that may be going a bit far.