Historical clue formulations

• Met someone? — 2026-06-11
• One who enjoys the high C's? — 2025-12-19
• Met someone? — 2022-04-02
• Met somebody? — 2012-07-29
• Attendee at a 17-Across performance — 2010-09-23
• Donizetti fan, e.g. — 2001-04-20