Its actually too small to be a con (I dont know about now) XD but I think the right word is "show."
An it is our excuse to plan cosplay, wear cosplay, maybe meet some VAs, do skits, have cosplay contests, have photoshoots, hang with people that also go to NDK, buy home-made things in the Artist's Alley, not to mention the dealer's room! =B
In my opinion~ it is worth it =OO