Judging by the number of closures in recent months, it may well be last call for the once-trendy Irish pub phenomena that mostly sprung from international interest in Ireland, tied in part to the theatrical production Riverdance in the mid-1990s. From the pubs of local ownership to national chains such as Bennigan’s and Fado, the prevalence of an Irish bar in which to enjoy a Guinness and offerings as diverse as bangers and mash and traditional music seemed to permeate every metropolitan area in the country. Denver was a little different, as some of the largest chains — some were called “pubs in a box” with decorations and designs shipped directly from the Emerald Isle to be reconstructed here — made themselves home to the faithful. But that’s waning, with a greater diversity of brewpubs suddenly overtaking what had been the mainstay of shamrock-loving patrons for years.