After a cursory search, it looks like there may have been a National convention in Hawaii in 1953, 1960 and 1967, at the very least.
I can’t narrow down the year of this shirt for sure [though someone noted it was 1954]:
But it looks virtually identical to this Los Angeles variant:
http://rock-a-hula.ocnk.net/product/2737 (sold for 30,240 Yen, or about $270 US)
And here I believe is the shirt from 1953:
http://rock-a-hula.ocnk.net/product/2694 (for sale for 91,800 Yen! or about $822 US)
Just look at all those Shriners, enjoying their Hawaiian shirts!
