Rager

A “rager” is a term used in internet slang to describe a wild and intense party or event. It is typically associated with a gathering or celebration that involves loud music, excessive drinking, dancing, and energetic behavior.

Examples:

I went to a rager last night and it was insane! There were people dancing everywhere, the music was blasting, and the energy was off the charts.
A group of friends decided to throw a rager to celebrate the end of exams. They invited everyone they knew, rented a huge venue, and ensured it was a night to remember.