Historical clue formulations

• Many Zoom calls: Abbr. — 2024-08-03
• Boardroom events: Abbr. — 2017-06-28
• Boardroom events: Abbr. — 2014-11-17
• Chairmen often call them: Abbr. — 2010-01-23
• Board events: Abbr. — 2007-07-29