from The Conservative Treehouse:

We are not going to play the insufferable game of pretending.  The stakes are just too high.  Today, the White House deployed a cover story for the assembly that accompanied Joe Biden to Austin, Texas.

As the story is told, the event was rescheduled from July 15th until today.  However, the untold part is the major medical incident, the fall in Las Vegas, actually being the disruption covered by the COVID diagnosis.