The most generally accepted alternative collision rules I've seen is the overlap where the red dot of a card is covered by the base of an overlapping...
Name: GenCon Participant - 1 Year
GenCon Participant
Name: PragueCon Ground Crew 2019 - Bronze
Awarded to those members that helped the Aerodrome with bringing one of it's North American members to Prague 2019. Not once, but twice.
Name: Doncaster Ground Crew 2017
Awarded to those members that helped the Aerodrome with bringing one of it's North American members to Doncaster 2017.