Jon Hamm, Nina Dobrev, Christina Hendricks, Elisabeth Moss, Ian Somerhalder and other TV stars hit PaleyFest 2014; Joe Biden speaks at the Human Rights Campaign Los Angeles Gala Dinner; Emma Roberts, Jaime King, and Emmy Rossum celebrate Sandro Paris at Chateau Marmont; Beth Behrs and Kat Dennings help honor Steve Martin at The Geffen Playhouse—catch up on L.A.'s top events of the weekend in this edition of Last Night's Parties.