Here's what I've got:
April 27 - PBMAS, Palm Beach, FL
April 30 - WORC, Dayton, OH
http://www.worcreef.org/Pages/FragSwap/2011/2011.html
April 30 - JARC, Joliet, IL
April 30 - NCPARS, Williamsport, PA -
http://ncpars.org/
May 2-6 - RAW, Sheraton Oceanfront Hotel, Virginia Beach, VA
May 7 - INDMAS, Indianapolis, IN
May 14 - BAYMAC, Hayward, CA
May 21 - TCMAS, Twin Cities, MN
June 8 - ETN, Knoxville, TN
July 9 - ORCA, Orlando, FL
http://www.reefcentral.com/forums/showthread.php?t=1965352
July 21-24 - ACA, Washington, DC
July 23/24- SEAMAX Seattle WA
July 23 - MASM Marine Breeder Workshop, Bloomfield Hills, MI
Sept - TBD, MASM's Midwest Marine Confernece
Sept - TBD, Midwest Frag Fest, Rockford, IL
Sept 9/10/11- MACNA 2011, Des Moines, Iowa
Sept 17 - CMAS, Chicago, IL
October 9 - BNARC, Bloomington, IL
October 22 - Reefapalooza, Los Angeles, CA
Nov 6 - Mountain West Reef Fest, Salt Lake City, UT
Nov 19-21 - CA, Ohio Cichlid Association Show, Cleveland OH