Unlike the other islands that have a large visitor base to support commercial luaus, Molokai doesn’t have enough visitors to support that kind of offering.
From time to time the local hula halaus (schools) will put on a luau and show as a fund-raiser to allow them to travel off island. Moana’s Halau usually has their big show in mid February.
Sorry to disappoint.
However, if you’ll be on Oahu during your Hawaii visit, I suggest Germaine’s Luau http://www.germainesluau.com. If you’ll be on Maui I suggest Old Lahaina Luau http://www.oldlahainaluau.com
Hope this helps.