>enter advance screening thinking it'll let me do the event (and just the event) early
>it's actually just a skip button to the start of S2
>can't leave to go back and do the 1.5 story until I progress enough in S2

This fucking sucks, and was not useful at all. What were they thinking in to letting you exit the advance screening? How far do I need to progress until I complete "Behind the Curtain"?