| Date | Grid | Clue | Author | Editor |
|---|---|---|---|---|
| Thu, Feb 16, 2023 | 21D | Event first observed in 1970 | Kevin Patterson | Shortz |
| Sun, May 10, 2020 | 81D | Observance first celebrated in 1970 | Adam Fromm | Shortz |
| Sun, Apr 12, 2020 | 22A | April 22 | Joel Fagliano | Shortz |
| Tue, Jan 14, 2020 | 8D | April event that's "green" | Jim Peredo | Shortz |
| Wed, Aug 07, 2019 | 17A | *Scarcity | Jeff Chen | Shortz |
| Mon, Dec 20, 2004 | 22D | Environmentalists' celebration | Kyle Mahowald | Shortz |
| Wed, Jan 21, 1998 | 39D | April celebration | Elizabeth C. Gorski | Shortz |