SLAC in the Batter's Box as 30,000 at AT&T Park Cap Off 2012 Bay Area Science Festival. One week after the San Francisco Giants won the World Series, a crowd of more than 30,000 took over AT&T Park for "Discovery Days," the climactic event of the second annual Bay Area Science Festival. In our first year participating, SLAC was front and center for the event, with a booth only steps from Giants home plate.