Ben Affleck, Lea Michele, Kristen Bell, Olivia Munn and more hit the blue carpet at the Do Something Awards; AnnaLynne McCord and Serinda Swan are among the many guests at Friends to Mankind's fundraising event; Brittany Snow, Jessica Stroup and others help raise funds for the Leukemia and Lymphoma Society—it was a very big weekend for celebrities giving back and we have the details on the top events around town in this installment of Last Night's Parties.