What do you get when you put 40 comedians on one stage for five hours in San Francisco? You get the 30th annual San Francisco Comedy Day of course. One of the biggest days in local comedy has featured names like Robin Williams and Will Durst over the years. But the best part about splitting your sides in laughter in Golden Gate Park is the cost: it's free. The comedians will gather in Sharon Meadow in Golden Gate Park Sunday at noon. Get there early and make sure to bring a blanket.