This weekend is the Greek Food Festival at the Annunciation Cathedral on Valencia Street. The Greek festival
is San Francisco's largest food festival, and I think the one which
really started the trend of so many churches having food festivals as
fundraisers.
I recommend going on Friday night, or early on
Saturday. By Sunday
afternoon, a lot of dishes are sold out, and by 7pm on Saturday the
buffet line wraps around the building. Make sure to do the wine
tasting -- some of the Greek wines will surprise you -- and to save
room for loukamathes (and maybe take some home).