Who knew? It's the third annual Santa Paula Balloon Festival.
This is something a Los Angeleno might want to do at the last minute. One can park near the train station in downtown Santa Paula and take a shuttle bus or just drive right to the place, which is on the east end of town (on the way to Fillmore).
They have wine/beer concessions, science exhibits and of course, balloon rides and races.
There's also a vintage Chevy and Indian motorcycle show tomorrow. I know it's last minute but if you're looking for something to do or are passing through the area anyway, worth checking out.