Historical clue formulations

• Horse in a harness race — 2019-10-14
• Competitor at a hippodrome — 2012-05-06
• Entry at a hippodrome — 2010-07-01
• Hippodrome competitor — 2010-05-14
• Horse in harness — 2009-01-30
• Competitor in a harness — 2007-06-29
• Many a Standardbred — 2004-07-02
• Dan Patch, for a famous example — 1995-06-03