What!?

Oldest DD has informed me that she wants to go to the homecoming dance. It only costs $20! Huh? I admit it has been 3 decades since I left high school, but really? $20? Oh my! So how does the date thing work? Are boys expected to pay the $20 for their dates? I cannot imagine how that works! Of course there is no date in sight for DD. I'm inclined to say 'NO' for this one! I never went to a homecoming dance because I never was asked... I'm thinking things may be different but not that different surely? Somebody give me some feedback please!!!