As there are a lot of Tales games that haven't been localized, I can imagine there are quite a few that not a lot of people have played. I've personally played and beaten only Abyss, Symphonia, and Vesperia, but I have the games for and have general knowledge of Phantasia, Destiny, Eternia, and The World.
As for unlocalized games, I have read the translated script and have played a little of the game for Hearts (which is one of my favorite Tales games without a doubt), I'm playing the translation patch for Innocence, and I know where to find a script for Tales of the Tempest in addition to having the game and being able to play it.
I've unfortunately only seen clips of Graces and Xillia. : ( Hoping to be able to import Xillia at the least at some point in the next year or so.
As there ARE a lot of people who only know the localized Tales games at Kumoricon (or, that's the assumption I'm going on), it'd be pretty obvious to focus on the ones that have been brought over from Japan primarily. I personally would like to incorporate the more obscure games in there somewhere, though, seeing as one of my favorite games of the series is only in Japan and doesn't look like it'll be brought over at all.
edit: I know the girl who runs the Tales of panel every year at Metrocon, and she gave me some ideas.
- She usually runs the panel for 2 hours (which is about the time limit I was thinking since this is pretty huge). During that time ...
- Discussion of Tales games, starting with localized/popular ones and going to the more obscure and unlocalized ones. She usually has a powerpoint for this.
- Hands on playtime with some of the tales games ... I don't know how possible this will be at Kumoricon. If I had my own car, I'd be able to bring a TV myself for this, and I don't know if Kcon will allow me to request use of a TV. If I could possibly secure a television, I'd totally bring my Tales games and my consoles and let people have some hands-on time.
- Screening of Tales OVAs/Movies/Anime episodes. This IS possible to do, even if we only get a projector. I have pretty much all of the OVAs and Animes that have been made out of this series on my external hard drive (and in the case of the Phantasia OVA, I have that on DVD), and I have no issue whatsoever with showing off a few of them if there's interest in that.
- Raffle off one or two figurines during the panel. I ... don't know if I'll have the money to invest in figurines to be raffled off, to be honest, but if I have the means to afford just one, I may be able to do that.
We don't have to do everything exactly like Metrocon's Tales of Panel, since this is Kumoricon and we can add on to things or take away things as we see fit. C: But I thought these suggestions from Taisa were pretty darn awesome.
Also, she recommends having an assistant who knows the series well enough to help out with things. If I end up getting the panel together, would anybody want to help out?