"An innocent-looking young boy mysteriously appears in a nondescript small town as the town recovers from recent storms. He was left behind by a ballet troupe that passed through, suddenly strange things start happening. He’s set to unleash his own reign of terror."

More info here:

https://www.dreadcentral.com/news/31...-ballet-blanc/

https://www.imdb.com/title/tt8184104/