Linked Events provides categorized data on events and places for the City of Helsinki. It serves as the common event database for all Helsinki city divisions and the hel.fi web services.
In the API, you can search data by date or location as well as bounding box.
The API provides data in JSON-LD format.
Event data is licensed using CC BY 4.0 license. FI | SV | EN However, images within the events may have a license "event_only" listed in the API, in which case the image is subject to a more strict license.
The browsable API contains usage examples if you choose to delve right in. The full API documentation is provided below.