I drove near there today and it certainly looks like they're working on it. I haven't heard anything so I think Peter is on the right track by emailing the company directly.
If the new place won't be open in time, the only other suggestion I could make is the Stone Grille & Taphouse, which is immediately off Queen Street on St. Charles Way. Even with traffic and lights it shouldn't be more than a 10/15 minute drive from the fairgrounds. I was in there a couple of weeks ago and I think the layout would certainly work for you guys. There are booths around the sides, but tables in the middle so it's very open and conducive for socializing. The food and service were both pretty good in my opinion. And, yes, they have many beers from which to choose.
Some drawbacks: the parking lot is not very big and I don't know if they could handle a hundred or so crazed model railroaders coming in all at once. The phone number is on the website if someone wants to call and find out more.
Incidentally, there is a new Hampton Inn being constructed on the other side of Queen Street on Pauline Drive. Again, I don't know when that will open. At the rate they're building, I would think it would certainly be open in time for October.
So, that's what I know. I'm not saying this would be the best alternative, but just another option to consider.