The annual Universal Whisky Experience in Las Vegas has become a celebrated gathering for aficionados of rare spirits to discover some of the most exclusive whiskeys in the world. This year’s event kicked off with a specially arranged tasting of some recently rediscovered bourbons, attracting a packed room of connoisseurs. These were very old bourbons that had been aging in barrels in Louisville, Kentucky’s historic Stitzel-Weller distillery, which dates back to 1935. Although the distillery has been shuttered…