Rachel Bilson, Michael C. Hall, Hailee Steinfeld, Sylvester Stallone and many more step out to Comic-Con 2013; Taryn Manning and Jon Lovitz check out furniture at the Camerich L.A. Grand Opening; Peta Murgatroyd and Chelsie Hightower throw a joint birthday party for a bigger cause; Kyle Massey, Kimberly Caldwell, and Ron Pearlman join Matt Leinart for his foundation's Seventh Annual Celebrity Bowl—get up to speed on Thursday's top events with this edition of Last Night's Parties.