Update 2021-04-27: According to recent reports, the current entry measures in Finland have been extended until at least 25 May.
In addition, the Finnish government published a relaxation plan, which for example provides for the admission of events with up to 50 participants and the opening for travellers from the EU from May. The complete plan, which is to be regularly adapted to the current infection situation, can be viewed at the link of the Finnish authorities.