Check out the community colleges, they have online class schedules, look for non-credit courses. I know CCSF has welding, I'm thinking of taking some of those. CSM has a welding class too, but a guy I work with took it and said they concentrate more on brazing than actual welding. I'm guessing that the East Bay has even more opportunities, being as how it's a bit more "Industrial" over there. Sequoia Technical Institute might be worth looking at.