Well I was under the impression that any performance in front of an audience was a "show" because in the 80's, there are entries of private parties and whatnot (etree, Phish Companion, Mockingbird, Almanac). Brad's wedding wasn't a public show, but I'd say it was a show nonetheless because the performance was in front of an audience. I'd also consider things like National Anthems and late night TV as shows even though the people in the audience were really there for the basketball game or Letterman or whatever.
Each individual performance has its own page in the wiki anyway. Private, TV, radio and other odd performances just don't get linked to a tour and they each get an explanation in the notes (as usual). I think if we go through and pick out all the performances that are not actual tour-related shows, then it will throw the stats off on the wiki. What we'd wind up with is people arguing what is a show and what wasn't a show when we could just explain the event in the notes, count it and move on to the next dead link.
This is a good discussion, yo.