I posted this in another thread about grad nights. We'll be there June 15-19, 2013 (with 3 park days 6/16-18). I read a lot of advice about avoiding days with grad nites so that's what I did! I hope this helps!
http://www.disboards.com/showthread.php?t=3013674
2013 Grad Nite Dates:
May 9th, May 10th, May 11th, May 15th, May 16th, May 17th, May 18th, May 22nd, May 23rd, May 24th, May 29th, May 30th, May 31st,
June 5th, June 6th, June 7th, June 12th, June 13th, June 14th, June 19th, June 20th, June 21st