Time your drive for late July and you'll be in Dawson in time for the famous Dawson City Music Festival.
Tombstone Territorial Park has a number of hikes that range in difficulty from easy stroll to grueling-but-satisfying trek.
Fort McPherson's Midway Lake Music Festival takes place on the August long weekend and is a great family-friendly festival.
Much of the NWT portion of the Dempster Highway winds its way through Gwich'in lands. Take the time to learn about the Gwich'in people who have lived in this area for millennia.
Go cranberry-picking along the trails at Gwich'in and J'ak Territorial Parks in September. (The best time to pick cranberries is just after the first frost)
If you visit in the late summer or early fall, you can watch the Aurora dance over the highway.
Participate in the Great Northern Arts Festival in Inuvik in mid-July to watch world-class Indigenous art from all over the North and see some excellent dance performances as well.