Most girls at my highschool didn't go to the prom at all. They were all waiting for Chads to ask them, and saying no to every normie & obviously any incel who asked them. Since they didn't have a date for prom, they didn't go. The girls that did get Chads to ask them to the prom were all dressed up and ready to show off, which is what those other girls couldn't face.
It was a good foreshadowing of what was to come. Women would rather not go to the prom at all, if it means going with less than a Chad. Even though it should be an event that is a big day in their life and look back at as fun. And a shared experience, including with normie guys who went to the same school.