In the livestream, it sounded like you can change the decorations in between each dance, so while the text strings always say prom, it’s possible to change the theming each time so it looks like a different dance time. I’m already planning on giving my teens multiple formal outfits - like a long dress for prom and a short one for homecoming.
I’d imagine it’s also easy to skip if the household needs to do something else that night, like the current festivals. Even if the other kids are talking about it, it’s probably easy to ignore.