There are not many occasions that would draw MC Hammer, Nancy Pelosi, Mark Zuckerberg and Joe Montana into the same room. But they all turned out for a screening of journalist Jose Antonio Vargas’ film “Documented” at the Yerba Buena Arts Center in San Francisco on Monday. Zuckerberg, whose FWD.us co-hosted with Define American, gave opening remarks about how his experience mentoring undocumented youths made him want to get involved in the fight for immigration reform. Other guests included Frisco Mayor Edwin Lee, Sheryl Sandberg, tech investor Ron Conway, Groupon founder Andrew Mason, Laurene Powell Jobs, Sophia Bush and Matthew Hiltzik.