I got invited to the Kālua this weekend and was told I didn't need to bring anything, just myself. 
The word kālua, which literally means "to cook in an underground oven", may also be used to describe the food cooked in this manner, such as kālua pig or kālua turkey, which are commonly served at luau feasts. Luau, in Hawaiian is actually the name of the taro leaf, which when young and small is cooked like spinach