Historical clue formulations

• The Admiral's Cup, e.g. — 2018-09-06
• America's Cup, e.g. — 2016-08-28
• Yachting event — 2011-10-21
• Yachting event — 2006-10-27
• Regatta — 2004-09-19
• Yachting event — 1997-10-17