Kelly Osbourne hosts the wild premiere party for the new season of "RuPaul's Drag Race" at Beacher's Madhouse; Kurupt and Raekwon make surprise appearances at the listening party for Schoolboy Q's new album, Oxymoron, at Sonos Studio; Red Bull Music Academy premieres the documentary What Difference Does It Make?—see who was out and about on Monday in this edition of Last Night's Parties.