Do we know for sure if "Delancey St" Stay and Scream will have Finnegan's open? I've seen "speculation" going both ways. If the restaurant is open during the day, I don't foresee a real problem with staffing it since the park closes at 7pm on non-event nights so they should have the staff to stay open until at least 6:30 on event nights.
I assume it will at least be open as a no-seating bar for those in the holding pen (like it has been at the event the past few years), but I sure hope they're open and serving food and they just changed the name of the S&S location since so many more people spend their time waiting out there on the street than inside the restaurant.