If you are looking for intensive Finnish language courses or courses on June, there are organized two week-long courses in June in the Finnish Bible Institute (Suomen Raamattuopisto) in Kauniainen. School is near to Kauniainen train station and easily accessible by local train from Helsinki, Espoo, Vantaa and Kirkkonummi.
Intensive courses are organized in week 23 (5.-9.6.) and week 24 (12.-16.6.) These courses concentrate on oral skills and spoken language. It is possible to participate to either course or both of them.
Courses are full time study from 9 o'clock to 14 o'clock and the course fee includes warm lunch and coffee break daily. Further information and application from this link: https://finnishcourse.fi/intensive-finnish-language-course/