Usually, if a show is labled as a "show" or "expo", that is exactly what it is - such as Hamburg or Repticon. The NARBC shows are vendor shows (with some additional events such as special talks and an auction) and they are some of the largest expos in the country. NARBC is the North American Reptile Breeders Conference. I believe the National Reptile Breeders Show is very similar to NARBC. Here is a link to the NRBS which might give you some additional information... http://www.reptilebreedersexpo.com/vendor%20list.htm