Emily Mortimer, Dakota Johnson and a slew of other Brits attend the BAFTA LA Garden Party; Marilu Henner, Steve Levitan and others in the industry step out for the WGA's 101 Best Written Series event; Angie Harmon and Sarah Michelle Gellar hit Kidstock at Greystone Mansion; Gwen Stefani and Gavin Rossdale bring the kids to a charity event for the Elizabeth Glaser Pediatric AIDS Foundation; Julie Bowen, Anne Heche and Arial Winter attend the Inspiration Awards; Rachel Bilson, Cindy Crawford, Emma Roberts and other fashionable celebs step out for a Chanel dinner to support NRDC—get the rundown on the weekend's top events in this installment of Last Night's Parties.