Historical clue formulations

• Annual observance for a global organization, for short — 2023-07-24
• 10/24 celebration of global cooperation — 2020-04-08
• International observance in 20-Down, informally — 2016-10-23
• Oct. 24 — 2012-05-25
• It's observed on Oct. 24 — 2009-03-24