This is what we found on Wikipedia regarding the Melbourne International EV AutoShow:

The Detroit Auto Show, formerly known as the North American International Auto Show (NAIAS), is an annual auto show held in Detroit, Michigan. Hosted at Huntington Place (formerly Cobo Center) since 1965, it is among the largest auto shows in North America, and is widely regarded as one of the automotive industry's most important events.

The show is organized by the Detroit Auto Dealers Association (DADA), and has been held annually in January for much of its recent history. It is usually open to the general public for 1–2 weeks, preceded by previews for industry employees and media, and a black-tie "charity preview" fundraiser for local children's charities.