No setlist is known to exist for this show.
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Per phish.com: "The information on the flyer has been adopted that there were three shows 5/22, 5/23 and 5/24 and the complete 5/21/88 setlist has been adopted as 5/22/88, for which there was currently no setlist on file."
Phish played at Nectar's in Burlington, VT on May 21, 1988. No setlist is known to exist for this show. This was part of the 1988 Tour.