Hi there Bill, Basically what it means is that the bike ( or car ) on concessional registration is allowed to be used for club type events/shows as per organised with your club. This also means you can use it to ride with other clubs events or outings provided you can show that you were invited ( who is going to turn anyone away on a Vincent !!!) It also means you can ride the machine within a 15 to 20 Km radius of your place of maintenance ( well we maintain our Vincents everywhere.....don't we....) Of course this really only becomes an issue if you get picked up by the Police, it's never happened to me but...it could happen. The younger generation of Police these days aren't quite as interested in our bikes as we think they might be.... We have a yearly registration of our cars and bikes here in Aussie, and the concessional rego is a bit under half the full cost of registration. Say full rego is $450 per year, then the club rego is around $200. But you must prove you are a financial member of a club for that type of machine. Cheers for now.....Greg.