So I couldn't make it out to NDK last year but I am about 95% sure I'm coming this year. I'm so excited! Anyways, here's what I can do:
Mid/High Level player looking for a band:
Instrument played: Guitar
Difficulty: minimum Hard, can do some on Expert
I can score
at least 90% on most songs on Hard, can do the same on some expert songs, never gold-starred anything though :'(
I only have like 2-3 downloaded songs so pretty much if it's not in the core games (RB1 or RB2), I haven't seen it.
Not planning on cosplaying this year although we'll see.

Also, I'm not very outgoing so don't look for power-slides or dancing.
Here's some quick stats I wrote down (I have gotten
better since, thanks to Rock Band 2):
(and yes, I know, these are RB1 songs)
Hard:Buddy Holly - 5 stars, 404 Note Streak, 99% (obviously one of my fav's Grin)
Reptilia - 5 stars, 229 Note Streak, 98%
Welcome Home (Coheed and Cambria) - 5 stars, 262 Note Streak, 97%
Are You Gonna Be My Girl - 5 stars, 221 Note Streak, 97%
Don't Fear the Reaper - 5 stars, 132 Note Streak, 95%
Expert:Creep - 5 stars, 204 Note Streak, 96% (can do better on Hard, another of my fav's)
Say It Ain't So - 5 stars, 137 Note Streak, 96% (can do better on Hard, another of my fav's)
Obviously I'm not the greatest player (again, no gold star songs still) but I have a blast playing this game and if there's room in a band, I'd really like to play. Also, if I get signed for a band and something prevents me from coming, I will give as much advance notice as possible but as far as I can tell right now, I'll be there this year.