Celebration tickets being non-refundable doesn't give us the east advantage of cancellation like SDCC tickets. I haven't considered the resale site. Keeping the tickets would allow us to partake in lotteries and the post-show store sale. ReedPop hopefully will still fulfill the pre-order Merchandise portions of orders at least.
The announcements during the show, books and toys, are my highlights. I will miss the Collectirs Panels, though like podcasts, I catch online versions anyway.
The Star Wars Show element, watching the last Celebration on YT, would the staple of any safe, virtual convention.