Definition of "luau"

Other Americans and Europeans also made their way into court, drawn by its brilliant pageants and lavish lū‘au, or feasts.

2012, Julia Flynn Siler, Lost Kingdom, Grove Press, published 2012, page 13

MM: No secrets for him because he's the king of Hawaii. And so he said, "Do you want to come to a luau with Sylvester Stallone and Arnold Schwarzenegger and Whoopi Goldberg?"

2014 July 7, Hermione Hoby, “Mike Myers: why I made a film about supermensch Shep Gordon”, in The Guardian‎