Someone got this right! It's the daily "Teer" in Shillong, where archers gather and shoot arrows for a fixed time at a target. The number of arrows that hit the target are then counted -- 767 in this case. The last two digits of that number, 67, become the winning number for the day, and people go off and collect their winnings.
A definite Shillong delight. Check it out when you're next there.