As elsewhere in Finland, we don't have many meetings amongst the mappers, but there was a related open data event OKFestival, 17 - 22 September 2012 in Helsinki. Organizing any OSM representation is still in the very very early stages.
Helsinki is the capital of Finland. With a population of 602 200 (30.9.2012) it is the largest city in Finland. The greater Helsinki region (pääkaupunkiseutu) has over 1 million residents and includes the neighbouring cities of Espoo, Vantaa and Kauniainen. In 2009 Helsinki gained more land, some 30 square km with only 1500 residents, from Sipoo, a much more sparsely populated