From the White House this morning at 8:20:

The president’s schedule today: NO PUBLIC EVENTS.

From the White House this morning at 8:40:

THE PRESIDENT WILL MAKE A PERSONNEL ANNOUNCEMENT AT 9:30 AM TODAY, SEPTEMBER 20, 2007, IN THE ROSE GARDEN.
THE PRESIDENT WILL HOLD A PRESS CONFERENCE AT 10:45 AM EDT TODAY, SEPTEMBER 20, 2007, IN THE BRADY PRESS BRIEFING ROOM.