Hey~ just thought I'd toss in my two cents...as you mentioned, you are both going to a rehearsal, so perhaps you could get a cup of something somewhere after, just to increase the number of times you've been together. A quick text saying just that, "You wanna go for pie after rehearsal?" Or Whatever you think would appeal to him.Then, if he doesn't answer, ask when you see him if he saw the text & "what do you think? Wanna go?"
I guess I wouldn't bring up too much regarding how you feel. Just be friendly, cool, interesting.
Do you remember that movie, "He's Just Not That Into You"? (cute movie) The message was that if a guy wants to see you, or call, or get together, he will make it happen.
I pretty much believe this to be true, without exception.
Throw it out there to get together after the event you will be mutually attending. His answer will guide you.