When you're using public spaces, the atmosphere can feel somber and impersonal, so it never hurts to add a little gentle humor to make the room, and the occasion, your own. Quotes, plays on words and puns added to banners and other signage will make people smile. Invent a creative sign for the entrance to your gathering (and make it easy to see). Try renaming the restrooms in a witty way that relates to your event or business. It's all in fun, and that's what will make it so charming.