The Curtis Cup has been postponed until 2021 because of the coronavirus pandemic.
The competition for women amateur golfers, between the USA and Great Britain and Ireland, was due to be held in Conwy, Wales in June and no new date has been scheduled.
Irish golfers Julie McCarthy, Olivia Mehaffey and Annabel Wilson had been named in the provisional squad announced last September.
The men's equivalent, the Walker Cup, is not due to take place until next year.
The British Amateur Championship at Royal Birkdale and West Lancashire and the British Women's Amateur Championship at Kilmarnock, which were due to take place in June, have also been put back until August.
Duncan Weir, executive director - golf development and amateur championships at the R&A, said: "We have a responsibility to protect the health and well-being of the players and everyone involved in our events so it is the right course of action to take.
"We are grateful to all of the venues for their continuing support in these challenging circumstances and will update everyone involved with our plans."
Ryder Cup captain Padraig Harrington has said it would be better to stage that tournament on schedule this September with a shortened qualification period than postpone the biennial showpiece.
