AnnaLynne McCord, Josh Henderson and Serinda Swan show support for The Somanly Mam Foundation at the 18for18 event presented by Microsoft; Ted Danson, Anne Heche and Sheryl Crow step out for the 6th Annual Oceana SeaChange Summer Party; Matt Barnes and Snoop Lion host the 1st Annual Athletes Vs. Cancer Celebrity Flag Football Game; Aubrey Plaza, Bella Thorne, and more help honor Latinos in Entertainment at the 28th Annual Imagen Awards—read up on L.A.'s top events of the weekend in this edition of Last Night's Parties.