Historical clue formulations

• Unpopular legislation of 1773 — 2020-09-20
• It led to a 1773 protest — 2017-10-15
• Cause of a 1773 "party" — 2015-07-01
• Precursor to a memorable Boston party — 2012-02-08
• It led to a 1773 Boston "party" — 2008-10-06
• Precursor to a historical "party" — 2007-10-13