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What is the Night of Fire? Is it a holiday? A celebration? A religious event?

It's an event representing fire as art object.

Cool! Is it an annual event? How many years have they done this?

Not sure if it's annual. I visited it first time this autumn. But believe me, there are lots of other events in Riga. Once you visit it you fall in love as I did

Once I visit, I'll fall in love with the city? That sounds like me and Tokyo...