Ski doo mentioned Glastonbury. Now that would be something. Probably THE music festival of music festivals. So renowned they sell their 70,000 or so tickets before they even announce the line up. Only problem it's in remote southwest England.
How about a show in New Orleans? Don't think anyones mentioned that. Not sure if there's a venue large enough (aside from the Super dome). What a fun town it is, just right for this crowd, and they can certainly take care of a bunch of out of towners. And a little love for our southern brethren.
It was mentioned Furthur might not be able to sell enough tickets to play the Gorge. That's hard to say. If enough folks were really determined to go see a show there, then maybe. Problem with this place it's in quite the remote spot. Camping would have to be offered, but I'm not sure it would be such a good place to camp. An awesome place never the less, and would be worth the trek. Covers our northwest folks.
I'd take a show in Telluride over Red Rocks any day having been to RR and only visited Telluride. But Telluride is truly a small slice of heaven. Also, Park City, UT or the Downs of Santa Fe. Mountain region friends covered.
As far as the oft neglected midwest, I'd take the Fox in St. Louis and Detroit. Blossom outside of Cleveland. A show in Grant Park in Chicago would be killer, but apparently the Charter One pavillion was a hit with the heads. Starlight in Kansas City would be the bomb.
As far as the northeast I say Bethel, MSG, Augusta or Portland ME, some Vermont love and wherever else y'all like. City Island in Harrisbug, as mentioned. Hampton while not necessarily northeast has a lot of good vibes. I like to see shows with a large (r) crowds because the party has greater potential with more attendees (under 15,000) However the band has to be able to sell enough tickets to justify wherever they go, so some of my choices are based on wishful thinking, and some on practicality.
Then again, I'd like to be able to see Phil and Bob spend more time at home, if they wish, at Tri/TxR/SW, despite the fact the demand/price so high and capacity so low. At the same time I would hope they'd continue spreading the love to the country at large for as long as possible. And maybe a trip over the pond even.
Oh, remnants of an '83 tour. Park West, RR, + the Downs. One of my favorite stretch of shows. Both music wise, + the scenic views. Not to shabby of shows either.