This is ground-breaking!
From October, 2019 edition of GOLF
Read all about this new golf tournament, The Scandanavian Mixed (https://www.golf.com/news/2019/10/14/scandanavian-mixed-men-women-golf/)

Men and women will compete against one another for the same prize money and the same trophy in a groundbreaking new event in Sweden. On Monday, Annika Sorenstam and Henrik Stenson announced the debut of the Scandanavian Mixed to be played in June 2020.
While men and women have played together in various formats, increasingly in recent years, the
The Scandanavian Mixed will take place at Bro Hof Slott Golf Club in Stockholm, Sweden from June 11-14, 2020. Sorenstam and Stenson, Sweden’s two most accomplished golfers, will serve as tournament hosts. Stenson himself has committed to play in the first three editions of the event.