| Clue | Source | Date |
|---|---|---|
| Scheduling alternatives | Eugene Sheffer | 03 Apr 2023 |
| Backup plans for outdoor events | LA Times Daily | 12 Jun 2022 |
| Backup plans for outdoor events | The Washington Post | 12 Jun 2022 |
| Parade planners' contingencies | Newsday | 27 Mar 2021 |
| Backup plans for parades | Wall Street Journal | 24 Apr 2017 |
| Event planners' backup times | ||
| Postponement precautions, in sports |