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が開かれた

was held

→ が
phrase Common #4,346
was held Used after the name of an event or gathering to say that it took place.
JA: 先週、会議が開かれた。
EN: A meeting was held last week.

昨日ジョーンズ氏のために歓迎会が開かれた。

A welcome party was held for Mr. Jones yesterday.

校長室で会議が開かれた。

A meeting was held in the principal's office.

その教授に敬意を表してパーティーが開かれた。

A party was held in honor of the professor.