The Musical
I am lucky enough to have seen 'Back to the Future: The Musical' in London's West End, when it first ran in 2022, and I can tell you that it was spectacular. I think a short-run was initially scheduled but by popular demand it is still running today.
The songs are great and there are a few differences to the film - e.g. there are no Libyans; instead, Doc dies by radiation poisoning. You can read about the other differences here: https://xstreamed.tv/back-to-the-future-the-musical-the-biggest-changes-from-the-movie/
If you are in London, it is a must-see.