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Initiatives by topic
Yhteismaa (Common Ground), a Finnish non-profit dedicated to participatory city culture and placemaking
In big cities, people of many different cultures live in close proximity. However, there often aren't enough chances for them to intermingle and experience the diverse traditions within their city. In an effort to bring people together and foster cross cultural interaction, local organizers in Helsinki, Finland, created "Ravintolapäivä," or Restaurant Day. Initiated in 2011, it began as a food carnival where anyone with a passion for food was encouraged to run a "restaurant" in their private home or in public spaces for a single day. Even though the pop-up restaurants charge money for the meals, the emphasis is not on profit, but rather on community teamwork and cultural exchange. During the event, Helsinki is transformed by hundreds of these informal restaurants serving a wide range of cuisines in this city-wide street festival. The event is put on through distributed organization — individual volunteer restaurateurs are responsible for finding a location, managing the menu and invitations, and setting the meal prices. Now, Restaurant Day has become a global movement, with over 27,000 pop-up restaurants having served over 3 million community members across 75 countries. —Khushboo Balwani 
Cottages and Allotments, City of Helsinki
Green Hearts, Park Walks in Helsinki
Sustainable transport activism
Train schedules: VR.fi EN
Bus timetables and routes in Helsinki region: HSL.fi EN
Towards sustainable economies
The federal government of Finland is currently (Oct 2017) conducting an experiment of the effects of a basic income on unemployed citizens, which began in January 2017 and will conclude in December 2018. 
News and comment
Helsinki unveils plan to reach carbon neutrality by 2035, Mar 21 
Safe, happy and free: does Finland have all the answers? Feb 12 
How one city plans to steer residents away from driving, Sep 26 
Free Cash in Finland. Must Be Jobless. Dec 17 
Helsinki Treats New Bike-Share as Another Form of Public Transit, May 27 
Finland is considering giving every citizen a basic income, December 5 
The Sharing Economy is Booming in Helsinki: Here's Why, October 22 
Dinner Under the Helsinki Sky Turns Busy Street into Community Table, September 14 
Helsinki Volunteers Reinvent the Public Sauna, September 4 
Why Helsinki – a mix of Detroit and Geneva – is one of the most exciting cities in the world, Aug 10 
Finnish parliament approves new climate bill that commits to 80% emissions reductions by 2050, March 6. 
Mobility survey reveals three-quarters of Helsinki journeys are sustainable, January 7 
Finland Sets New Goal For Cutting Greenhouse Gas Emissions, June 11 
"Finland is about to start using crowdsourcing to create new laws", September 20 
Restaurant Day 2015, Visit Helsinki, approximately once every three months
Apps for sustainability
Täsä, city of Turku. Mobile app, which helps capture citizens' ideas regarding urban development sites.
Citizens data initiative
Urban Facts, open data at the City of Helsinki.
Sompasauna, wood burning self-service public sauna in Helsinki built and maintained by a group of volunteers.
Helsinki Region Transport - Vehicles, bus and tram (English)