Open Data Day is an annual celebration of open data all over the world. For the tenth time, groups from around the world will create local events on the day where they will use open data in their communities. It is an opportunity to show the benefits of open data and encourage the adoption of open data policies in government, business and civil society. Naturally, all outputs are open for everyone to use and re-use. You can find more info about Open data day here.
In Finland, Open Knowledge Finland (OKFI) organises different kinds of workshops regarding open data. The event is held in Helsinki at the central library Oodi. Read more about the workshops from OKFI's page.