Oh, what did Hamish Bowles and Blake Lively cook up when they went surfing together in San Diego for Vogue’s June issue? Perhaps in the time they became chummy in their wetsuits down there, they decided it would be a good idea — and only fair after Blake’s two Vogue covers — to give Hamish a cameo on Gossip Girl. And then maybe Vogue decided it would be a good idea to use that screen time as a publicity vehicle for Fashion’s Night Out, which will figure into the plot of two episodes of the show airing in September. Yesterday in New York, Hamish and fellow Voguer Lauren Santo Domingo filmed cameos for the show, involving them planning for the event. The episodes sound amazing already — now they just need to convince Blake Lively to bartend or be a cocktail waitress for one of the FNO parties.