Banners are an essential part of planning any prom, but that's especially true with the city theme. When you walk around a city, you're simply bombarded with banners for every reason possible. Give your theme a little more character with banners. You can use them to advertise for the event or to add unique decor during the event.
You senior prom is a once in a lifetime event that should be celebrated. With all the work going into decorating the venue and the effort put into getting ready for the evening, there are bound to be countless pictures taken at the event. Get the credit you deserve by strategically placing banners around the room that say things like "Prom 2016" or "Thanks Parents Club" so that your photo backgrounds will be filled with meaning.