At a typical US high school, not very many of the students are actually playing. For most of them, it's mainly a social event, something to take a date to, or a time to hang out in the bleachers with peers.

Even if you have one child playing (or on the bench, or in the band, or cheerleading) and have come to watch, your other similar-age children will likely not be interested in sitting with you. They will want to sit with their friends, and rightfully so!