I am an Instrument of Fate

I had an appointment with someone today in her office, a place I've been several times before. I crossed the street and started up the block her entrance is on, and passed a doorway with a sign for something else. I walked on, but saw no other doorway until I reached the end of the block where another wrong doorway was. What? Could it be in the next block? I looked ahead, but there were no doors in the next building, and then the street ended. Was I on the right street? Confusion reigned. I went into the music shop I was in front of and bought something. I considered asking for a phone book to check the address, but it was too crowded, so I went back out and walked BACK down the block, past the last wrong door, and all of a sudden, right there in the middle of the block was the door I was looking for. A big door, with a big, white sign. IMPOSSIBLE to miss. I went up, bemused and disgruntled. We talked, and as I prepared to leave she looked down at the bag I was carrying from the shop I'd gone in to. Oh! She'd forgotten to buy tickets at that store for a concert later this month! How lucky that I had reminded her! I told her about the door, of course. She had a right to know.