Each team must include 20 to 25 members; only 20 people will be able to pull the plane — it’s recommended to have extra people in case of day-of absences.

Source: https://www.centralmaine.com/2023/08/28/registration-open-for-travis-mills-foundation-plane-pull-in-portland-oct-28/

For sit-down restaurants, reservations ahead of time are encouraged, but there are often day-of reservations available on the app at even the busiest spots.

Source: https://www.bostonherald.com/2023/05/21/bringing-kids-to-disney-world-how-to-make-most-of-your-trip/

The course challenge for each event will be determined day-of based on river flows.

Source: https://www.realvail.com/vail-whitewater-race-series-set-to-start-in-may/a15884/