The more I think about it I believe I am confusing HC with Senior night. HC is done at half time I believe and no parents but the full court (King & Queen along with a male and female attendant from each class). So each class votes for their respective attendants and I don't remember if just the seniors voted for King/Queen or if they narrowed it down and then there was a school wide vote.
This is the same school that (one town in the school district has a Labor Day parade) and they have a football parents float in it where many of the parents ride it, (generally it's the ones who graduated from the school, us out of towners usually will just laugh at them).