None have sold out as of yet, but the first one to go will be the last one, it's on a Friday, I believe. Then, if any others sell out, they will likely be Friday ones as well. Friday brings a lot of locals out.
Unfortunately you are out of luck. Same thing happened to us, sort of. I had purchased tix for my sis to MNSSHP and her plans changed. I couldn't get a refund but I was able to sell the tickets to someone else.