I searched and searched and read and read and I still don’t really understand what is ‘‘Once upon a time’’ and, most importantly, when it takes place.
Is this like a pre-fireworks show ? Is it scheduled on Disney website not long in advance ? In the current schedule, it looks like it stops in early October. We are going early Nov. and I am wondering if I can hope to see it…
It’s a projection show on the castle.
It doesn’t relate to HEA as such, it replaced Celebrate the Magic (I think it was called that) and is sometimes before HEA and sometimes after. I don’t know if it’s shown on party nights but I would assume it always is when HEA is on.
Oh that might explain why it wasn’t on some nights this week because MNSSHP has begun…
I guess then probably just not scehduled yet for October/November.
Thanks ! 
I have found that it will not be scheduled on initial park hours, but is added after HEA when hours are finalized and extended.
I went to it because the Wishes fireworks crew chief told me it was a great show. I loved Celebrate the Magic, and do not feel the Once Upon A Time has the same “heart”. Watching it I knew why the fireworks crew prefer it- it has some small fireworks!