Usage patterns
〈人〉をフェアに扱うto treat someone fairly
The coach treats all the players fairly.
〈場所〉でフェアを開催するto hold a fair/exhibition at a place
The book fair is held in Tokyo every autumn.
フェアな試合a fair match/game
Both teams tried to keep the game fair.
フェアに〈動詞〉to do something fairly
He's a player who always competes fairly.