"Gakuensai" or the fair is usually held on autumn season.

Each university fair has its own unique feature and the event generally lasts three to four days.
"Gaigosai" is hosted by Tokyo University of Foreign Studies Fair Committee. There will be theater performances conducted in various languages. Students from each language department will take part in the play and show their enthusiasm for the art and culture of each region. Another attraction is ethnic food stands or restaurants where you can enjoy almost all cuisines of the world during the festival at the site. Each language department opens a special eatery place and offers the exquisite regional cuisine.
The 91st Gaigosai is to be held from November 20th to 24th, 2013.
Please refer to the following link for the direction:
http://www.tufs.ac.jp/english/access/