Answering 2 questions --
-Yes, we're only scheduling SRM #'s 15 through 20. Some of the GMs who will be at the con might know other SRM events. If they do, you may be able to persuade them to run extra sessions. I'd encourage bribes of food and (adult) beverages. #15 was released to the website back in May. DragonCon is in September, which means the adventure will have already been in public circulation for 4 months. I'm not comfortable using anything older than that.
-Yes, the adventures are listed correctly. The person who's coordinating our events at DragonCon decided that this was they way to do up the schedule. As I won't be there, (making it "not my problem
) I didn't think it was worth arguing over.