I went to Grand Targhee last year, and had a blast! Super laid-back
scene and well organized. When you lay your tarp down on Friday,
it's there for the weekend. Thus...no "waiting in line for numbers" game.
While there is no carside camping, the parking lot is next to the
campgrounds, and since there are plenty of trees, shade campsites
are plentiful. While concessions are much fewer than at a Planet
Bluegrass fest, what is there was very good overall (especially the
booth serving only buffalo and elk!), and the Grand Targhee Ski
Resort itself is very sweet without being stodgy.
If you go, I would recommend going several days early just to either
hit up Yellowstone National Park, the quaint town of Jackson Hole,
or camp out at Teton Valley.
Plus, the Thursday evening before the festival, the town of Driggs
will host a free concert, as they have a weekly concert series in
the Summer. Last year, it was an all-star lineup of the musicians
who taught at Grand Targhee's new bluegrass camp: Mike
Marshall, Tony Trishka, Scott Nygaard, Ben Winship, Brian Wicklund,
and Eric Thorin...and Darol Anger just happened to arrive early
and joined in on the festivities.
I had enough of a great time that I plan to go again this Summer.