Wasgij? Mystery Puzzle 25 Eurosound! (1000pc)

Good evening puzzlers, this is Wasgij calling!

The incredible Eurosound Contest is underway, with musicians from around the globe competing to deliver the most spectacular performance of the night.
Is the current act starting to lose the crowd, or will they have a surprise in store to secure maximum points from the judges?

Use your imagination, and the clues provided on the box, to piece together what will happen next. This is the scene you will have to puzzle.