yeah it's pretty hard to be sad at conventions, most people are either REALLLLYYYY hyper, tired, or pissed off at something/someone.
I only saw one person that was sad, and that was mewtwo, because someone stole her badge
I was happy most of the time, and only got pissed once on the first day when we were standing in line, but that was just because we sent 2 friends down to save our spots while we got dressed and then once we got down there, they wouldn't let us in with them =/