The bill is expected to face legal challenges as it goes into effect next month.
Thursday's event also included the announcement of next year's lineup, which includes Annie Leibovitz, Rick Steves and more.
Former state Rep. Julio Gonzalez, R-Venice, will discuss the American Constitution and the federal court system on Thursday, March 21.
Do Walls Work?
New College human geography professor Ilaria Giglioli on how we got where we are today and what our future might look like.
More than 25 percent of state's labor force made up of immigrants.