Kelp is still an important commercial product of Hokkaido and at this shop, you can find and get various kelp related products.
During summer, many events are held. Festivals of Shinto Shrines, fireworks displays, Buddhist Bon festival, etc.
Here below are some that I've found so far.
Date: August 14, 2007(Festival Eve) and 15
Place : Hakodate Hachimangu Shrine in Yachigashira town.
(Nearest tram stop is "Yachigashira", the last stop. After getting of the tram, walk toward Mt. Hakodate, and you'll find Torii Gate easily. About 5 minutes walk from the tram stop.)
You can find this buckwheat noodle restaurant near tram stops, Hakodate Dock Mae（函館どっく前）, or Oomachi（大町）. If you get on a tram from Hakodate Ekimae or Jujigai and get off the tram at Oomachi, walk in the same direction that the tram goes away. Soon you will see a convenience store, Seven Eleven on your right. Then you will find the restaurant on your left. A character "越" in a circle is a good sign to identify.
Place: Museum of Northern Peoples
21-7 Suehirocho, or at the bottom of Motoi-slope, the building in the corner. Nearest tram stop is Suehiro-cho.
Term: until September 24, 2007
Hour: 9:00-19:00(No close during the term)
Admission : adult 300yen, student 150yen