Maybe his plans changed yesterday and he couldn't make it. Maybe he actually wants to see you w/o no hidden agenda. No one knows what goes through their minds, not even themselves. The best thing to do is try not to worry about it. The delivery man is coming to pick up his package...you can always be in another room when he picks the drums up or you can leave for work a bit early and leave him to do whatever he needs to do to get them loaded up and on his way.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.