Mt Ive has a very good 2 strip airport that is Kincaid capable. All the accommodation will have been booked out a year ago. It will be camping only. The only access to the lake for speed week is via Mt I've. The lake is about 30 km from the homestead, so you will be hitching rides. Speed week gets over 1000 people, so the resources of MtIve are heavily taxed. You should call and speak to Joy or Anita.
Closest fuel is PtAugusta. They have Mobil swipe. It's a nice airport. Stop by the RFDS office and leave a donation.