Table:
text: 1988 Australian Touring Car Championship
Race Calendar
Race Calendar
Race_Title Circuit City_State Date_ Winner Team
Calder Calder Park Raceway Melbourne , Victoria 8 - 10 Apr Dick Johnson Shell Ultra-Hi Racing
Launceston Symmons Plains Raceway Launceston , Tasmania 11 - 13 Mar Dick Johnson Shell Ultra-Hi Racing
Winton Winton Motor Raceway Benalla , Victoria 8 - 10 Apr John Bowe Shell Ultra-Hi Racing
Perth Wanneroo Park Perth , Western Australia 22 - 24 Apr Dick Johnson Shell Ultra-Hi Racing
Adelaide Adelaide International Raceway Virginia , South Australia 29 Apr - 1 May Dick Johnson Shell Ultra-Hi Racing
Lakeside Lakeside International Raceway Brisbane , Queensland 20–22 May Tony Longhurst Freeport Motorsport

text: 1988 Australian Touring Car Championship
Race Calendar
Race Calendar
Race_Title Circuit City_State Date_ Winner Team
Sandown Sandown Raceway Melbourne, Victoria 27–29 May Dick Johnson Shell Ultra-Hi Racing
Amaroo Amaroo Park Sydney , New South Wales 17 - 19 Jun John Bowe Shell Ultra-Hi Racing
Oran Park Oran Park Raceway Sydney, New South Wales 15 - 17 Jul Dick Johnson Shell Ultra-Hi Racing

Question: On what date of the 1988 Australian Touring Car Championship did Dick Johnson compete at Calder?