Last night, Trey Anastasio kicked off a rare solo acoustic run in Northampton, MA with a whole host of surprises including the first acoustic versions of tunes like “Discern” as well as Phish rarities “Walfredo,” “All of These Dreams” and newer Phish cuts like “Winterqueen,” “Steam” and “More,” among others. The show signaled the start of a run of shows for Anastasio and if opening night is…