Historical clue formulations

• Like 29 winners in the first 50 New York City Marathons — 2026-09-10
• From Nairobi, e.g. — 2025-04-07
• Many a marathon winner — 2020-03-30
• Many a New York City Marathon winner — 2015-11-26
• Nairobi resident — 2015-07-06
• Like many marathon winners — 2006-02-23
• Like the Mau Maus — 2005-08-25
• Many a marathon winner — 2003-07-10
• Nairobi native — 1998-09-01