The Million Pirate March
Ahoy there, during today's 2008 Bay to Breakers footrace in San Francisco, there will be a Million Pirate March along the route! It will be a "celebration of rum, parrots and peg legs."
They have some useful info in their links section, including a downloadable Word document on how to build a pirate ship out of a shopping cart (why they didn't make a webpage out of it, I have no idea).
If their site is correct, there should be plenty of pictures and maybe videos too afterwards. Arrrrr. Click here to go to their site.