By getting into ATP or WTA.
BTW any grand slam is under open era now so there are no needs for getting qualified you just have to register yourself, and then there will be the tournament where you will be tested against all world class players
1988
The Masters, US Open, The Open and USPGA Championship.
On the 11th of November 1987, Ireland qualified for the 1988 European Championship Finals.
U.S. Open Chess Championship was created in 1900.
British Open Championship Golf happened in 1997.
Canadian Open Chess Championship was created in 1956.
There is no entry fee...you have to qualify by meeting certain requirements. One arduous way you can qualify is by winning your way through several rounds of qualifying tournaments and some of these may have an entry fee but it can take months and is very very tough.
The Masters, US Open, The Open and USPGA Championship.
The French open tennis championship is played in Paris, France.
U.S. Women's Open Chess Championship was created in 1934.
Dutch Open Computer Chess Championship was created in 1981.
Japan Women's Open Golf Championship was created in 1968.