Of course, the LA of Pink Day in LA is Lion's Arch, and there are two of those now. GW-EN's solution is to host parties in Lion's Arch in both Guild Wars and Guild Wars 2. Up to three international districts in Guild Wars will be hosted, as will the Henge of Denravi, Dragonbrand, Stormbluff Isle, Jade Quarry, Darkhaven, Sanctum of Rall, Underworld, and Desolation servers in Guild Wars 2. You don't really need to be playing a Guild Wars game to participate: GW-EN is encouraging people to tun into the radio stream and celebrate the event no matter what game they play. Maybe we'll all accept that LA can be found in our hearts, not on some server somewhere.
Hit up the official Pink Day website for full details, including a prize list and information on how you can help.