Just as the debate over the Defense of Marriage Act heats up in DC, the Human Rights Campaign and Calvin Klein will host another star-packed event to support marriage equality at the brand’s Madison Avenue flagship store April 17. Calvin Klein creative directors Francisco Costa and Italo Zucchelli will be there to support the cause, as well as Neil Patrick Harris, Dan Stevens, Josh Lucas, Alan Cumming, André Balazs, Uma Thurman, Linda Evangelista, Stefano Tonchi, Sean Avery and Carolyn Murphy. The event will promote HRC’s high-profile Americans for Marriage Equality campaign, which kicked off in 2011.