Do you have a food cart? I live in Portland which is supposedly the food cart capital of the world, so I may have a bit of a skewed perspective, but around here, every company like yours operates primarily as a food cart. The income isn't as good as catering events, but if you set up in a good area, you will get a shit ton of exposure, and any good food cart in Portland usually has catering gigs booked months in advance. Not sure how well that model would work in the Bay area, but I know when I was there last week I was craving some good food cart food, and didn't see many of them. It might be a relatively untapped market down there, though you make need to drop a few thousand dollars for a good cart, which you might not have handy in the short term.