The Fremont Solstice Festival is always entertaining. It's best know for the parade and its collection of naked bikers (mildly NSFW pictures here). While looking at the "official" entertainment, though, don't ignore the crowd. The people watching is awesome.
For example, folks crowded around some beautifully (and weirdly) decorated cars at the Art Car exhibit.One woman had a cat on her shoulders. The cat was very calm, climbing all around her head. That started to draw the crowd away from the vehicles as people wanted to pet the cat. She smiled gleefully. Suddenly her other pet poked out from her hair and crawled around her neck.
Then it started to lick her teeth. Woman, cat, and rodent all seemed quite happy and pleased with the attention. And the gathered crowd tried to make sense of this alternative little family.