Hint #1: 20A, 37A, 67A, 11D, 39D all have something in common
Hint #2: the two examples from these groups of 7 were randomly chosen - you don't have to manipulate them any further... focus on the title instead
Hint #3: the title doesn't have to do with drinking, but it does have to do with the math game referenced in 48-Down
Hint #4: if you google the rules of the game, players take turns counting out 1, 2, 3... but when they get to 7 or any multiple of 7 they say BUZZ
Hint #5: extract the letters from boxes 7, 14, 21, 28, and so on...