Awesome, yeah, go for it! I'll probably be adding things slowly as I get free time, but you're welcome to add as much as you'd like!
(I'm finding shows that need multiple cast list pages as I do this too, which is why some of them don't have links yet. I'm gonna go back and work on those for shows that have been staged multiple times. Some I could have sworn were made, but I can't find the Genji one anywhere. So maybe I'm going crazy.)
Nostalgia Across the Sea is loosely based on real events, but the names of all the Japanese characters were changed...would it be worth mentioning who it is based on anyway?