I think the 25th Anniversary was referring to the 25th year of production for the Camaro (1967 + 25 yrs), although some of those 'clubs' were begun more than 25 yrs ago (prior to now).
Note re some of these 'clubs': They are not really 'clubs', but are privately owned BUSINESSES, intended solely for the profit of the owner. They sell 'memberships', which are really nothing but subscriptions to poor magazines for the most part, until they realize they don't make money printing magazines, and then stop without any compensation to the 'members'. The 'members' of these 'clubs' have Zero input to the operation of the organization. One (or both?) of these Camaro organizations was begun by an individual who began the CCCI (as a club), but when we incorporated due to growth, he put his own name down as 'owner'. When questioned about this by all the people who worked for the club, he said he had to put down something and it didn't 'mean anything'... It probably didn't mean anything until he sold our 'club' to a private business a couple of years later and profited to the tune of $$$SevenMillion$$$.