Kanda Shrine is found in 730 and it was worshipped for the protection of Edo city for long time. Not only, New Year worship, Kanda Festival (神田祭) which is held every other year is also very famous festival in Tokyo.
Enshrined Gods:
Daikoku
Skunamikona
Tairano Masakado
Kanda Festival is in Middle of May.
Official web site of Kanda Shrine: http://www.kandamyoujin.or.jp/