1. A social gathering characterized by a relaxed, informal, and casual atmosphere where guests feel comfortable and at ease without strict rules or rigid structure
We're having a laid-back party this Saturday with just close friends, some snacks, and music.
Vamos fazer uma festa descontraída no sábado com apenas amigos próximos, alguns petiscos e música.
2. A party where the focus is on enjoying company rather than elaborate entertainment or formality
It's a laid-back party, so don't worry about dressing up too much.
É uma festa descontraída, então não se preocupe em se vestir demais.