International Automobile Trade Motor Show Girl, Sao Paulo, Brazil

An auto show, or motor show, is a public exhibition of current automobile models, debuts, concept cars, or out-of-production classics. It is commonly attended by automobile manufacturers. Most auto shows occur once or twice a year. They are vital to car manufacturers and local dealers as a public relations exercise, for advertising products, and for increasing publicity.
There are other auto/car shows that occur on a more frequent basis, like weekly. It's not known if there is a regularly accepted term for these more frequent, informal "car rallies" or "car enthusiasts events". Some meeting events have themes, such as classic cars, hot rods, etc. In any case, these car gathering events are more localized, typically consisting of car enthusiasts who meet to socialize and enjoy their enthusiasm with other car owners.
The Organisation Internationale des Constructeurs d'Automobiles organises many auto shows.