NB: question resolved, update in separate post.
A calendar listing in Colorado Springs Gazette-Telegraph, August 27, 1977, p. 22D, indicates a show on Sunday, August 28, 1977 at Folsom Field in Boulder featuring Willie Nelson, Emmylou Harris, Dave Mason, Jerry Jeff Walker, Stillwater and Jerry Garcia.
I am going to check the Denver/Boulder papers for this. Stay tuned.
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