Thursday dinner pre show suggestions?
There's now a Mercatto (Italian restaurant, which gets generally pretty favourable reviews on this board) in the Eaton's Centre:
Or, you might consider the 3 Brasseurs on Yonge. It's a chain, but (at least the one time I went there) I found it to be a cut above the average chain (perhaps because it's French?). Having said that, it's not going to be a truly chow-worthy experience so don't go in with expectations that are too high. Don't be put off by the fact that it focuses on beer -- it's totally appropriate for kids, and even has a kids' menu.
Also, I second the Harlem recco (though I note that I haven't been there for a while, and I seem to recall reading some not-so-favourable reviews on this board in recent times).
15 Toronto Street, Toronto, ON M5C 2E3, CA
Not too exotic or fancy, but many choices to suit each person's taste would be the fairly recently renovated Marche at Brookfield Place. (Yonge @ Wellington.) It's close enough that your group can walk back to the theatre after dinner within 15 minutes. It's semi-buffet style where you walk to various stations and pay for what you choose - prices are a little higher than average but there is a wide selection. Enjoy the show - I thought it was fantastic!