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You are probably right. I don't even know how this event is called in English. A direct translation would be ancient lights night.

Edit: Okay I did a quick research and found this, looks like its a Baltics region thing.

Come to the shore of the Baltic Sea which unites all of us. It is a link between our neighbours, fellow-countrymen and people from all around the Sea.
Now is the time to think about the significance of the Sea. The Sea must be well-kept and protected in order for own sake and for the sake of our descendants.

That is cool. I like that is a call for all the people around the Baltic Sea.