What's "homecoming"?

Native speaker’s answer
Rebecca
"Homecoming" is an American high school and college tradition. It's when many of the school's alumni and current students come back to watch a football game. The week following up to the big game, there are dress-up days at school, a school dance, a parade, etc. There is also a vote from the students on a Homecoming King and Queen in their senior (last) year of school.