It might be the SAP event that alternates between the big island's Kohala coast and Maui every other year. I've been unfortunate to get caught up in this thing twice. They basically commandeer all the hotels in the area for 5 nights to treat their global high performers to an all expense paid trip. I was at the Mauna Kea last Feb and had to shorten my stay by 2 days due to this event, they booked the entire hotel as well as the Hapuna, the Hilton, the Mauna Lani, the Fairmont and parts of the Marriott. I'm sure it's the same deal in Wailea when they run the event in Maui. I'd advise going to another part of Maui or another island unless you want to feel like an outsider at a corporate retreat.