Old Watertown/Nothing much happening down on Main, ‘cept a little rain… Something’s happening in Watertown – on June 3, to be precise.  That’s the date when UMe and Frank Sinatra Enterprises (FSE) will release a remixed and expanded edition of Frank Sinatra’s 1970 masterwork Watertown on CD and digital/streaming platforms.  In addition, the remixed album only will be reissued on vinyl. Watertown remains an album unlike any other in the Sinatra discography.  The seeds of the two-part suite were planted when Sinatra met with Frankie Valli of The Four Seasons.  Valli’s longtime…