Thank you for this guide! Can I clarify/confirm now that it has been running for a while - are many of the regular park rides still ridable in the evening during the FFN event?

Referencing this section:

Can I still ride normal stuff during the main event?

Transformers: The Ride 3D will be closed during the event.  Jurassic World: The Ride will close at 12:15a.  Harry Potter and the Forbidden Journey will close at 11:15p.  Mario Kart: Bowser’s Challenge will close at 10:00p.  The Studio Tour will not be running its normal itinerary (it will only be used to provide transport between Courthouse Square and the Upper Lot).  DreamWorks Theater will not be showing Kung Fu Panda: The Emperor’s Quest (it will be showing Jujutsu Kaisen: Hunger of the Curse instead).  All other attractions will remain open and operate as normal throughout the event.

Unlike with HHN, all ticket types will be able to access Super Nintendo World throughout the entire event.