This is the 26th season of Alastair Moock’s Pastures of Plenty series, which  The Boston Globe describes as “jam-happy hootenannies with swashbuckling doses of impromptu adventure and sly reinventions of old folk chestnuts… The hippest hootenanies in town.” Two shows this year at Club Passim: Friday, November 6th with Mercedes Escobar, Eric Royer, Sean Staples,…