The first was on April 3, 1956 aboard the USS Hancock. Elvis played ?Shake Rattle And Roll?, ?Heartbreak Hotel? and ?Blue Suede Shoes" on that show.
The next show was the famous one because it was the one which Milton recieve what they call "Pan Mail". Pan Mail is letters from the fans hating something about the program of the week before. That show was on June 5, 1956. He sung Hound Dog is the only song I know of.
I am not for sure of the second date but the is the info I found on it.