I think the teasers show pretty well what's likely going to happen.
First teaser, Sophia at the corner following Aiden&Friends.
Second teaser, I assume it's either Andre and Jennifer being blurred out, or Sophia. Could Aiden possibly have asked Sophia to watch the show through the classroom door's window?
Third teaser, possibly Sophia's POV watching the show peeking through the small window.
Atleast that's how I see the bonus event playing out. Could be totally wrong ofcourse, but we'll know soon enough I guess.