The behind the scenes tour is pretty cool

Every time there is a Friday the 13th, they will do a nighttime tour
by flashlight. I did that. It was fun. And they let you keep the flashlight.

I think they might also do this on Halloween, but of course, it can be a bit
crowded that night.

I'll have to check into this "Winchester: Behind the Music" thing you are
talking about and see if that is interesting (sounds like it would be).