noun
garden party
A social gathering held outdoors in a garden or park, often with food and drinks. The term is a direct loan from English and carries the same connotations.
週末に友達の家でガーデンパーティーを開く予定です。
We plan to hold a garden party at a friend's house this weekend.
会社のガーデンパーティーで新しい同僚
I talked with new colleagues at the company garden party.