cultural celebration taking place in an outdoor, possibly snowy setting

cultural celebration taking place in an outdoor, possibly snowy setting. Several people are gathered, including some dressed in traditional costumes. There's a person in a large, shaggy, dark-colored outfit with attached bells, dancing near a man beating a green drum. Another individual is wearing a blue outfit and a tall, colorful hat, also with bells attached to their attire. People are filming the spectacle with their phones. A Bulgarian flag is visible in the background, alongside other buildings, under an overcast sky.