large crowd of people gathered at night in front of a large, lit-up building

large crowd of people gathered at night in front of a large, lit-up building. Many people are holding Bulgarian flags. Above the crowd, blue lights are projected onto the building, forming shapes that might be words or symbols, but the view is obstructed. The camera is moving, showing faces in the crowd. The overall impression is that of a protest or gathering with patriotic sentiments.