The couple had planned to mark their first year of marriage with a party at the country retreat after holding a small scale ceremony due to Covid curbs.
Save-the-date cards had been sent to family and friends for a “champagne-soaked soiree” on July 30.
But critics attacked the couple for planning to hold the bash at Checkers and claimed that was why Mr Johnson wanted to remain in post while his successor was selected – something Downing Street rejected.
Education Secretary James Cleverly said even if a new prime minister is in post, the celebrations should still be at Checkers in Buckinghamshire.
He said: “If that is done by that point, I suspect it would be a rather generous action of the new prime minister to allow that to go ahead. Private functions like that do not impose a burden on the public purse.