The West Side Invite
Hardcourt Bike Polo Tournament
May 23-26, 2008, Memorial Day Weekend
Portland, Oregon

The P.U.M.A. site has a little info about this one, a serious main race and the usual side events with polo being a single day, single elimination tournament.

Results:
Winners, “The Seattle Polyolos” (Drew, Seabass, Soren) Seattle