
If the show is based on the group system there must be an AVNSC class scheduled - however, there doesn't need to be one for each group, just a general one will do. The winner of that will go into the relevant group. At a group show only best of breed and best NSC winners can go through to the groups. If you only enter an AV class at a group show you can't go through as you've not been in breed/nsc.
If it's not on the group system then any unbeaten dog can go into the group - this will enable anyone entering AV classes and winning them to go through to the bun fight. Non group shows don't have to schedule an NSC class at all.
Hope that makes sense, but probably not!
Kate