In 1899, William E. Metzger helped organize the Detroit Auto Show, only the second of its kind, after the 1898 Paris Auto Show. An auto show was held in Detroit in 1907 at Beller's Beer Garden at Riverside Park and since then annually except 1941–1953. During the show's first decades of existence it portrayed only a regional focus. In 1957 international carmakers exhibited for the first time.
In 1987 the Detroit Auto Dealers Association (DADA) proposed it become international. The members of the DADA went to places such as Europe and Japan in the attempt to convince those unveiling their new brands or vehicles in those countries to bring those unveilings to the North American Auto Show. That attempt proved to be successful; the North American Auto Show was then renamed the North American International Auto Show in 1989.
The NAIAS is the only auto show in the United States sanctioned by the Organisation Internationale des Constructeurs d'Automobiles. Over 800,000 attended during the days the show was open to the general public in 2018. It is estimated that the show generates a revenue of over $500 million to the local economy. The show begins with press preview days, industry preview days and a charity preview event. The charity preview raises money for local children's charities. In 2004 and 2005, the charity preview attracted 17,500 people at $400 a ticket and raised $7 million in total. 2006 was the sixth consecutive year the charity preview event raised over $6 million. 35,711 tickets were sold for the industry preview representing people from 24 countries in 2005 and 6,897 credentialed press from 63 countries.
According to wikipedia