A tip from us on the track who have worked with this for many years.
The tip is for you who organize but dont pay for everyone in your group. Changes or cancellations are possible no later than 7 days before driving.
Make sure that those who say YES pay you at the same time.
If someone doesn't show up on raceday...
It can be: having a cold, oversleeping, mowing the lawn, party breaker, double booker, etc.
Then there will be no setback for your group financially.
Everyone is responsible for THEIR cost regardless of whether they are coming or not.