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How to recreate a prom for someone who missed theirs 
Obtain a good, realistic venue. 
Your ideal venue is any facility with some kind of dance floor, such as a ballroom at a hotel or even a community center, and/or a high school or college auditorium or gymnasium. As long as you have some kind of reasonable dance floor, any venue will do if it feels realistic enough.
Check around in the area where you are planning to hold the event. Consider hiring an event planner if you can afford to do so.