Haven't had time to look more thoroughly, but based on the pictures you've posted, as well as text and tags from the linked one, the search should actually center on VANCOUVER's Pride Parade (they're from that city's West End, near English Bay, which is consistent with the route the parade took the one time I -- cameraless, alas! -- saw it)...
Edit: ...and you might also check out
http://www.youtube.com/watch?v=CIpWT7KWaNg my connection is slow and has only loaded 40 sec of the 2+mins, and it's only actual (and non-topless!) skateboarding so far, but...