The Bummershoot Festival is a music festival.
Lisa and her imaginary friend Quilloughby went to the Bummershoot Festival because The Snuffs were playing there, which was the band that the real Quilloughby was a member of. Quilloughby was really negative about the festival and hated it. When The Snuffs went on stage, the real Quilloughby had changed a lot since he was younger, having become racist and started to eat meat. This angered the crowd and a riot started at the festival.