Towne Center
I don't know how far in advance but I think you need to talk to the people at the Towne Center. That is the place where you pick up your keys, get parking pass, buy tickets to shows and get your tickets for the Monday night event at GC. You can try 1-800-615-6511 x 8216 or 471-332-8344.
I have not attended one of the show/buffet events but I am sure it is worth it. We were at the resort this July 4th. They didn't have the usual Monday event but they had a cook out for $3 a person. It was burgers, hot dogs and all the usual cook out food. Various local shows gave a little preview. There was face painting, a bounce house and other things for kids. That night they had a remarkable good fireworks show. I don't know why they charged the $3 because it was worth ten times that. Maybe they did just to get a count.
Thanks,
Joe