Restaurant Day was invented here in Helsinki May 2011. The first time there were 45 restaurants in 13 cities. Today there are 2000 restaurants all over the world.
I have been attending the event many times, not every time but like every other I think. The most memorable restaurants for me have been Le Frog in Siltasaari (August 2011) and a restaurant at someone's home in Kruununhaka that served tasty crostinis (August 2013). There has also been many more really nice and interesting restaurants. Some years there have been so many customers that most of the restaurants run out off food. Those times I ended up eating in a real restaurant.