MangoSirene. I apologize for troubling you, but I have a cosplay question. I'm attending a convention in two days and I want to cosplay Marceline and Grell in Wonderland, but I'm not staying at a hotel so I'm trying to figure out a place where I can change. This is my second convention, so I'm still very new to the whole thing, so I'm consulting you, the expert, on the subject. Are there any places where you can change your costumes??