Table:
text: LPGA Championship
Winners
Winners
Year_ Dates Champion Country Score Margin_of_victory Tournament_location Purse_ Winners_share_
1961 Oct 12–15 Mickey Wright (3) United States 287 (+3) 9 strokes Stardust Country Club 15000 2500
1960 Jul 1–4 Mickey Wright (2) United States 292 (–4) 3 strokes Sheraton Hotel Country Club 15000 2500
1959 Jul 2–5 Betsy Rawls United States 288 (–8) 1 stroke Sheraton Hotel Country Club 7500 1247
1958 Jun 5–8 Mickey Wright United States 288 (+8) 6 strokes Churchill Valley Country Club 7500 1247
1957 Jun 6–9 Louise Suggs United States 285 (+5) 3 strokes Churchill Valley Country Club 7600 1316
1956 Jun 21–24 Marlene Hagge United States 291 (–9) Playoff Forest Lake Country Club 6500 1350

Question: When was the tournament held at Forest Lake Country Club in the LPGA Championship?