Finnish Outdoor Association Suomen Latu is challenging everyone to sleep outdoors on Finnish Nature Day 28 Aug 2021. With everyman's right, it's possible to sleep outdoors in the nature or spend the night in your own backyard. There are also events you can participate in. Suomen Latu is organising three main events called Metsähotelli® - Forest Hotel in different parts of Finland. The locations will be published in January 2021.
There will be also tens of smaller events around Finland. Organisers will publish information during spring and summer. Then you can find basic information of those (in Finnish) on this site and some events are also in Facebook. You can use search key words "Nuku yö ulkona" or check the events on Suomen Latu Facebook page.