First of all, I seriously do not wish to be mean in any way, but...
Paper-Roxas, regardless of the fact that not many cosplayers have been checking in here that often, I find it HIGHLY rude to just suddenly decide on a day/time like that without the opinion of other people. Having it on the last day is especially lame, since a lot of Naruto cosplayers might be involved in other photoshoots that day (for example, I will be attending the Yu-Gi-Oh photoshoot) or else might be leaving the con and not have time to cosplay at all.
My suggestion - that it be on the 2nd day of the con, at a decent time (between 1pm and 4pm).