Here in the UK we need a pass to display on the car when we attend Circuit Assemblies at Hayes Bridge. It is obtained from a nominated elder and it is a requirement that you have a full complement of passengers.
As regards the Regional Convention at AMEX in Brighton there is very little on site parking. Disabled drivers can get a pass and so can essential workers but once again you must have a full compliment of passengers. The preferred method of travel is a hire coach or public transport. Getting out of the car park at the end of the day is a nightmare apparently.
George