overnightparty
nounUK /ˌəʊvəˈnaɪt ˈpɑːti/
US /ˌoʊvərˈnaɪt ˈpɑːrti/
A fun time when friends sleep at someone's house and stay up late together.
Mia packed her sleeping bag and teddy bear for the overnight party at her best friend's house.
OTHER MEANINGS
2. A party that lasts through the whole night.
The club hosted an overnight party to celebrate the new year.
3. A gathering where guests stay until morning without going home.
The students had an overnight party in the gym after the game.
4. A celebration that continues until the next day begins.
Their overnight party turned into breakfast together at sunrise.