What is meant by "group booking price band"?

This is the price band that is applied to all bookings in a group, except for the lead group member. By default this will be set to your 'Pay as you Go' price band, however this can be changed. Just bare in mind that all activities that allow group bookings must have prices set for this price band, otherwise you will run into problems.

1. Go to Settings > Bookings > Booking features.