The two most prominent classic car clubs in the U.S., the Antique Automobile Club of America (AACA) and the Classic Car Club of America (CCCA), are this weekend hosting a joint car meet for the first in their 65-year histories.

The meet, held May 11 through 13 in Auburn Auction Park in Auburn, Indiana, will coincide with an Auctions America sale and feature a show car competition overseen by judges from both organizations.

The variety of cars there should rival the most diverse car meets: neither the AACA or the CCCA discriminates solely on marque, and all cars on the field will be of a vintage of at least 25 years.

What has traditionally separated the AACA and the CCCA is the definition of “classic”: the AACA was founded in 1936 with the understanding it was any car, truck, or motorcycle a quarter-

century old or better. The model year a vehicle has to be to qualify as a “classic” thus rolls over every year.

In 1952, a group of dissatisfied AACA members left to form the CCCA, which only recognizes as “Full Classics” – a trademarked term – certain specific cars from 1915 through 1948, often from the premium end of the market as opposed to lower-caste Chevys and Fords.

“This was way overdue, and it makes sense,” Steve Moskowitz, the executive director of the AACA, was quoted in Hemmings regarding the meet. “In the end, we’re not in a competition—we’re all here to do what we can to promote the hobby.”

He says AACA event attendance hasn’t flagged yet, but that his co-directors “are looking at the long-range graying of the hobby, and nothing is guaranteed unless we stay attuned to what is going on.”

(via Hemmings | photo of Cobble Beach Concours d’Elegance in Ontario, Canada)