Table:
text: 1981 Australian Touring Car Championship
Race Calendar
Race Calendar
Race_Title Circuit City_State Date_ Winner Team
Launceston Symmons Plains Raceway Launceston , Tasmania 1 Mar Dick Johnson Dick Johnson Racing
Calder Calder Park Raceway Melbourne , Victoria 15 Mar Peter Brock Holden Dealer Team
Oran Park Oran Park Raceway Sydney , New South Wales 22 Mar Dick Johnson Dick Johnson Racing
Sandown Sandown Raceway Melbourne, Victoria 12 Apr Dick Johnson Dick Johnson Racing
Perth Wanneroo Park Perth , Western Australia 26 Apr Peter Brock Holden Dealer Team
Adelaide Adelaide International Raceway Adelaide , South Australia 3 May Peter Brock Holden Dealer Team

Question: What date is the Wanneroo Park circuit held in the 1981 Australian Touring Car Championship?

Question: Which team has a Calder title in the 1981 Australian Touring Car Championship?