Historical clue formulations

• Professional pitcher? — 2024-08-03
• One working on a keynote — 2023-12-22
• Key worker? — 2023-08-24
• One working with a set of keys — 2023-06-02
• Professional at pulling strings? — 2023-03-03
• One involved with a grand opening? — 2018-09-04
• One who works on a grand scale? — 2009-10-18