afterparty

2. A smaller, more private gathering held after a formal event such as a concert or awards show.

The band invited a few fans to their afterparty backstage.

3. The social time following a meeting or conference where people talk informally.

The conference afterparty gave us a chance to meet the speakers.

4. A continuation of a celebration at a different place, often later at night.

We left the club and headed to an afterparty at a friend's flat.