Historical clue formulations

• "Don't wait up" occasion, perhaps — 2025-01-10
• Promising romantic encounter — 2024-07-23
• Much-anticipated outing — 2024-06-22
• Reason to get gussied up — 2022-03-15
• Test in chemistry? — 2021-01-22
• Occasion to get all gussied up — 2020-10-04
• Chemistry test? — 2018-11-10
• Exciting romantic prospect — 2016-10-12
• Much-anticipated social event — 2003-12-27