after-hours party

noun
UK /ˌɑːftərˈaʊəz ˈpɑːti/
US /ˌæftərˈaʊərz ˈpɑːrti/

A party that happens after the usual time when a place closes.

The museum held an after-hours party for its workers.


OTHER MEANINGS

2. A private party in a store or office after it has closed to the public.

The bookstore's after-hours party was only for club members.

3. A party that goes on late into the night after a main event ends.

After the concert, fans went to an after-hours party nearby.

4. A gathering held outside normal business hours for invited guests.

The gym hosted an after-hours party to thank its trainers.