If you're not doing anything New Year's Eve, you may want to wander over to the area under I-5 at 65th & Ravenna to check out the weekly bike polo match, which starts around 9 p.m.
The regulars play a finesse game, which makes it fun to watch.
For an example, check out the video, which was shot there in April by Forest Hoag, who has a blog, natch.