You know the old joke: Q: How many anarchists does it take to change a lightbulb? A: Dude, anarchists don’t change anything! But don’t tell that to the various activists who will be showing up at the Brick House Gallery in Oak Park Saturday from noon-10 p.m. for the third Sacramento Anarchists’ Cafe. Representatives from anarchist groups in Los Angeles and San Francisco, as well as Sacramento, will be speaking and holding workshops in the edgy art gallery all day long. They range from SANE, a group that runs a needle exchange, to Courage to Resist, a group that helps GIs who wish to terminate their military service. There will even be a workshop on “Herbalism for Women” and a represe