It was supposed to be the celebrity party of the summer — had it not been for that pesky Delta variant. When the 60th birthday bash for former president Barack Obama went down on Saturday, it was a much more scaled-down affair than planned. At the last minute, big names were cut from the once-lavish guest list. Among the axed was Larry David, and when The New York Times revealed that one of comedy’s masters of disgruntlement had been disinvited, everyone thought the same thing: It would make a great Curb Your Enthusiasm joke.