Victoria Justice and other musicians hit the stage for the Big Time Rush tour announcement; William Draven, Bai Ling, and fellow stars walk the blood-red carpet for the Los Angeles premiere of Stitches; Magic Johnson, George Lopez, Sandy Koufax and a stadium full of fans including unofficial mascot, Dodger Elvis, attend "A Brand New Blue" opening day event at Dodger Stadium; 98.7 FM contest winners and special guests rock out to a private rooftop show featuring Alkaline Trio at the historic Hollywood Tower—get your party fix with the top events from Monday in this edition of Last Night's Parties.