Jam Night began as a blog post on this very site in 2013. The story is very autobiographical, but certainly has enough details changed from my junior high years.
Book Description from Amazon.com:
Jackson Junior High holds Jam Night every couple months — a time when students can dance, play games, and hang out with their friends.
For new kid Scott, Jam Night is a place to confront his anxieties about his place at school, including school bully Randy.
This is a short story, around 2,500 words.