Is there a creation date limit for vids?
No.
(Note: very old vids may be *small*, like 320 x 252's from the 1990s, so they mey have trouble because of video quality, but not age of creation alone.)
It also doesn't matter what other conventions, screenings, or awards your AMVs have won, if they have never before *shown* at previous Kumoricon events.
So - LET'S SEE WHAT YOU'VE GOT !!!