Historical clue formulations

• Start of many a party — 2021-09-18
• It gets the party started — 2019-09-27
• Party warmer-upper — 2008-09-16
• Conversation starter, maybe — 2006-03-22
• Tension easer — 2005-08-26
• Arctic vessel — 2003-10-16
• Conversation starter, maybe — 1996-04-17