Two of them, Genericon and ConnectiCon, are already SOLD OUT as far as vendor opportunities, but you can still attend them. The other two, Farpoint and LunaCon, still have vendor space available.
Do not be surprised if The Kabrini Message turns up at one or both of these (Farpoint and LunaCon) bringing the "message" direct to the sci-fi fan base!
If so, it will be definitely be a new experience! Stay tuned, will let you know for sure...
February 15th - 17th, 2013
March 1st - 3rd, 2013
Rye Brook, NY
March 15th - 17th, 2013
July 12th - 14th, 2013
*Here is the website I used to find these, but it has info. on shows all over the country and some international ones as well. http://www.upcomingcons.com/science-fiction-conventions