My DD and I did! We made a mother/daughter trip out of it.
We did the MK parade, but the basic idea is the same. Dancers are bussed backstage, then dance along a parade route. A few studio staff are allowed along backstage. In MK it’s the typical parade route. Sorry I don’t have details about the Epcot route!
You can get FP and dining assuming you get your confirmation code in time. If I remember correctly they don’t get it for is in time for ADRs but we did have it around 67 days, so could make FP. I think, TBH, I had a campsite or value reservation that I cancelled once I got the real confirmations in.
Your studio will be given a schedule so you can see which park you need to be in on which days. Again, can’t remember when we got details. But Dance The World has generic schedules which our trip followed so those were helpful.
I used TP fax to request an area at CBR but we were put with the rest of our group, so in my case it didn’t work.
You will have so much fun! I sobbed seeing DD dance down Main Street! So amazing! We hope to go back in 2021 (our studio goes every 2 years, but the summer heat was almost too much for DD10 and so we can’t take the whole family along in summer til they’re older).