from what i read about last year, the skits are from the anime itself and stuff, but what about 2008? have any rules changed? and i'd also like to know if a group of people can cosplay as a group[ex: naruto characters] and do a skit that includes characters and dances from other animes?[hare hare yukai?]
yes, you can incorporate stuff from other animes, but keep in mind that the hare hare yukai dance in skits, while fun, is pretty overdone at this point.
also, oni-con 08 is about 8 months away, and the kind of stuff you're looking for will probably not be added until a few months beforehand. The rules from last year are a pretty good guideline as the only thing that usually ever really drastically changes is the weapon's policy.
If you read the threads from last year, you will find a lot of the information you're asking for. Also, looking up skits on youtube will give you some good examples of crossover material and such.
The pocky skit was awesome...
Information on the new cosplay contests will be posted up over the next month or two. We have a lot of new rules, guidelines, and events happening, so keep an eye on this forum, and the main website.