I'll be there next week too, for the same reason! The
D23 website says that each presentation "premieres" on a given date/time and can be accessed on the D23 website or the D23 Facebook and YouTube sites. Only two of them require advance registration - "Globetrotting with Mickey Mouse and the Walt Disney Archives" on Wednesday afternoon and "Creating Fantastic Worlds: A Journey into Disney Worldbuilding" on Friday afternoon. So hopefully all segments will be available later.
If they had announced this several weeks ago, we might have cancelled our trip for next week!
Edited to add - I just registered for the Friday one, and it says it will be available Nov. 20-27. I tried to register for the Wednesday one, and it says it will be available Nov. 18-27. So sounds like it will all be available through the 27th. Now to try to figure out why it recognized my Gold membership for the Friday presentation and not the Wednesday one....