YOU SAID:

I did a planning competition the day prior today

INTO JAPANESE

今日は前日に企画大会をしました

BACK INTO ENGLISH

Today we had a planning tournament the day before

INTO JAPANESE

今日は前日に企画トーナメントがありました

BACK INTO ENGLISH

Today we had a planned tournament the day before

INTO JAPANESE

今日は前日に計画されたトーナメントがありました

BACK INTO ENGLISH

Today there was a tournament planned the day before

INTO JAPANESE

今日は前日に計画されたトーナメントがありました

BACK INTO ENGLISH

Today there was a tournament planned the day before