This year's Yokohama International Cocktail Competition will be held on October 9 at Workpia Yokohama. Doors open at 12:30PM and the competition beginning from 1PM. Yokohama's Yamashita area is the location of the venue. You may the area as home to the first Western-style bars in Japan!
Tickets to the event are 4000 yen and only available at the door. No details yet about exactly what that includes, but I find it hard to imagine this event isn't all-you-can-drink.