From 6:30-9:30pm at the Polygon (behind the Oriental Bazaar on Omotesando) 

Map: http://www.kokusaika.org/english/polygon.html 
For JAMBO members, the cost is 3,500 yen for men and 3,000 yen for women w/reservation (or plus 500 yen if you go directly without making a reservation). 
All beer, wine, cocktails, sot drinks + sushi buffet, garden salad, veggies, cheeses, breads, and pies for dessert included. 
Reservations can be made with David at jambodave@green.email.ne.jp or phone (03-6599-8112) by May 11. 　 Half of your admission fee will be donated to 
Friends of the Earth Japan (a wonderful environmental group　-　http://www.foejapan.org/) and Charity Water (a group which brings clean, safe drinking water to people in developing countries – http://www.charitywater.org/).
So you can have an enjoyable evening and help a good cause at the same time. If you’d like to go with David, please meet at Exit A1 of Omotesando Station 
at 6:15PM on the 12th.