That screening of Return Of The Jedi at Star Wars Celebration, the one that will probably be the Maclunkey version, is not free of charge. I just assumed this was free for Celebration ticket holders. Instead it is an extra $40/50 per ticket, plus $5-7 processing fees!:

“Join D23: The Official Disney Fan Club at Star Wars Celebration with an exclusive screening of Star Wars: Return of the Jedi! Enjoy complimentary popcorn, water, and a commemorative gift. Tickets on sale March 16 at 11 AM ET / 8 AM PT! https://d23.com/d23-event/return-of-the-jedi-40th-anniversary-screening-in-london”

https://twitter.com/DisneyD23/status/1635693023123374080