I had no idea about this new firework day either until I saw the seller stalls this autumn and heard the fireworks from the suburb nearby. They have been consumerisming the venetsialaiset thing (did not even exist like a decade ago) so hard.

Kekri was an ancient deity, looks like a Karelian one so this too might be a part of the way we have culturally appropriated Karelian beliefs. Or might be this was a thing everywhere, but the custom has survived best in the Karelian region. It has apparently been also politicized by Maalaisliitto at one point. But it is very much like Samhain, even has the same beliefs of a kind of liminal space from harvest to when a new cycle begins with the dead walking the earth and ancester spirits being restless. Pretty cool.