The Bee cast is really sweet -- all of them. I'm not sure who comes out regularly or whatever, but they're all very nice. There's no stage door, so just wait in the lobby.
You'll see barricades at Barefoot -- when you exit the theatre, make a left, and it's right there. They all sign, I believe. Patrick is the sweetest -- extremely kind and down-to-earth.
For Sweeney, also look for barricades to your left as you exit the theatre. It's also overall a really kind cast. They all willingly sign and pose for pictures, etc.
A work of art is an invitation to love.