This looks like it will be a great fair. The Umasugi Gourmet Fair at Tokyu Toyokoten. (loosely translated as too delicious gourmet fair)

A wide variety of food including Chinese soup dumplings, karaage (juicy Japanese fried chicken), ramen, and much more.

Tokyu Toyokoten in Shibuya. 8th floor.

Note that the event closes at 6:30 p.m. on the final day.