Overland Expo West is a large overlanding event in Flagstaff, Arizona, that features several days of vendor exhibits, demonstrations, classes, and community activities. This is possibly the largest overlanding event in the United States. The organizers host several other versions of the expo in other parts of the country, including on the East Coast and Pacific Northwest.
The West expo is held in Flagstaff's Fort Tuthill County Park, a large wooded park that offers onsite camping hear the expo grounds (which books quickly).
The three-day event has a packed schedule. You can spend a couple of days just perusing the gear expo booths and outfitted vehicles on display. At night there is a charity raffle where you can win overlanding and off-roading gear.