The land and water areas of Suomenlinna belong to the Finnish State and are administered by the Governing Body of Suomenlinna, which reports to the Finnish Heritage Agency. The fortress, under UNESCO’s protection, and its sensitive nature require stricter event related restrictions than in other public urban areas. Events organised in Suomenlinna must honour the World Heritage value of the fortres ...
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If you want to organise an outdoor even in Suomenlinna, you need an outdoor area use permit.
You can find permit related information online: https://suomenlinna.fi/en/explore/event-facilities/booking-instructions-prices-and-terms/
The telephone number of the sales service for conference and banquet facilities is +358 (0)295 336 420 and their e-mail address is tilavuokra@suomenlinna.fi.