I'm not sure we can make a "Dog Party" sign, even if it's in Japanese. I saw this at the AX site and got scared:
"Prohibition against the Use of Signs "
"All signs, whether for a costume prop or not, are prohibited unless approved in writing for specific use by Anime ExpoŽ. Unapproved signs will be confiscated and repeat offenses may lead to individuals being asked to forfeit your attendee badge and may result in being banned from the convention."
Not sure I want to mess with that. 0~0