I think you got "props" mixed up with "signs." Anime Vegas does not allow signs unless you have our approval through email before the start of the con. It would be pretty silly to not allow props!
Next Up:Mad Hatter Tamaki (Ouran Host Club), Tuxedo Mask (Sera Myu) and Kaitou Sinbad (Kamikaze Kaitou Jeanne)
I declare this The Year of Making Epic Jackets