When the 4 year-old boy got up on the stage and took the microphone the jury stood up. The words are superfluous.
It seems like you’re asking for a revision or clarification of the sentence. Here’s a revised version without the superfluous material:
In the heart of the concert hall, a spectacle unfolded
The 5-year-old girl steps onto the stage, her small
It seems like the boy delivered an outstanding performance
The scene unfolded as the boy, filled with determination
The video of an 84-year-old grandma singing “
It sounds like you’re describing a heartwarming moment!
Wow, that’s incredible! A performance viewed
The 5-year-old girl steps onto the stage, her small