YOU SAID:

I players in a school concert last night

INTO JAPANESE

昨夜の学校のコンサートで奏者を演奏した。

BACK INTO ENGLISH

I played a player at a school concert last night.

INTO JAPANESE

私は昨夜学校のコンサートで演奏した。

BACK INTO ENGLISH

I played at a school concert last night.

INTO JAPANESE

私は昨夜学校のコンサートで演奏した。

BACK INTO ENGLISH

I played at a school concert last night.