As long as this has come up, we support cosplay and suiting at Everfree NorthWest, but we are requesting that suits and cosplays be kid-friendly and remain in theme with the convention as stated in our policies here: http://www.everfreenw.com/policies.php
We're at our core a pony convention, and bear nothing but tolerance & love to other fandoms. As such, we're -not- saying a hard no fursuits, just asking if attendees can try to keep them in theme please. We'd ask the same if someone wanted to come as Naruto! Or a Stormtrooper! But, that's not to say you can't suit! If you REALLY want to wear a non-themed suit, why not MAKE it themed by having the suit be COSPLAYING one of the characters?
Here's a few suggestions:
Pony quad fursuit
Anthro pony fursuit
Griffon or Diamond Dog suit
Dragon suit or cosplay
Hydra!
Sea Serpent!
pony cosplay
fursuit in pony cosplay
cosplay in pony cosplay? (Maybe could work?)
Darth Pony
Lots of ideas!