I sailed on Brilliance of the Seas a few years back and do not recall anything special being done for St. Patrick's Day.
Mary Lou Scanlon
NCL Pride of America April 24, 2010
NCL Epic February 12, 2011
RCCL Allure of the Seas - September 18, 2011
Celebrity Eclipse - February 11, 2012:
RCCL Navigator OTS - February 9, 2013
I sure hope so ... We're going to be in Hilo on Celebrity's Summit on St Patty's Day, & I'm hoping that they will be sreving corned beef & cabbage in the dinning room that night.
Let us know how it is, if they do. Personally I doubt you are going to get it. Hilo probably doesn't have the same Irish culture as Boston or NY.
I was in LA a few years back & was hard pressed to find corned beef & cabbage; I ended up eating a ruben at an "Irish pub." I was appalled when the waitress asked me if I wanted bean sprouts or mayo with that.