What makes you think parents are involved? Every one my teens have been involved in these things did so without my knowledge (dd19 asked her then boyfriend to the senior prom by writing in her theater bio in the play program - I didn't know about it until opening night). I can't even remember how ds18 asked his girlfriend to the junior formal although he told me after the fact, when I asked. Teens spend so much time online, they have way more access to ideas, videos, pictures, etc., than adults.
My sons would never had gone to these dances if they were expected to do this back in their HS days