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.
To qualify for The Open Championship (British Open), players can secure a spot through various means, including placing well in designated qualifying tournaments, such as the Final Qualifying events held prior to the tournament. Additionally, top finishers from the previous year's Open, as well as players ranked highly in the Official World Golf Ranking, are given exemptions. Amateur golfers can also qualify by achieving success in specific amateur championships. Overall, qualifying involves a combination of performance in both professional and amateur events.
The French open tennis championship is played in Paris, France.
Dutch Open Computer Chess Championship was created in 1981.
Japan Women's Open Golf Championship was created in 1968.