If you have flowers left over from lei-making, encourage your female guests to wear them tucked behind their ears. At a lu'au, it's traditional to sit on straw mats, on the ground. Gather as many low tables as you can for your guests to dine on. Old matchstick-style window shades make great table coverings. Lu'au food is served buffet-style, not in courses.
All dishes go on the table at the same time.
Like many other things in Hawai'i, lu'au are casual. Kick off your shoes, serve the food on paper plates, and enjoy the company of good friends.