Canton resident Jo Barker was a lifelong macro-brew drinker until she became a craft convert at Mahaffey’s Pub on Dillon Street seven years ago. She joined the bar’s beer club, where you get respect for drinking hundreds, even thousands of pints of unique beers. She was awarded with her own barstool at 300 pints, the right to be called a “Dame” at 1,000, and a gift card at 2,000. But none of those things would have been good enough to serve as a worthy tribute when she became the first customer to hit 3,000 unique beers consumed at the bar. And at first, the folks at Mahaffey’s couldn’t figure out how to honor that special customer. Then, they struck gold.