noun
festive mood; holiday mood; festive atmosphere
Describes a lively, celebratory feeling like that of a festival, often used for excited anticipation before an event.
街はクリスマス前でお祭り気分だ。
The town is in a festive mood before Christmas.
優勝が決まって、チームはお祭り気分に
After the championship was decided, the team was enveloped in a festive atmosphere.