Hands down:

The Eastern Sports & Outdoor Show, running February 7 through February 15 in Harrisburg, Pa., is the region’s biggest outdoor sports show.

No doubt :

This is the show of the year, the big one, probably the largest in the country.

The show, commonly known as the Harrisburg Show, takes eight whole
days and two entire buildings to
showcase all exhibits and events.

Check out the floor plan (pdf) for an idea
of the size.

Exhibits feature every imaginable
type of outdoor display, including
fishing tackle, charters, guides and lodges; hunting gear, guides and
lodges; boats; outdoor vehicles
like ATV’s; and you name it. It's
almost too much to describe.