In my dream last night, everyone I was with just vanished...

In my dream, I was out with a group of people, walking across a town square. I stopped momentarily to look at a
monument, and then, when I looked for the other members of the group, they had vanished. Every last one of them! What to do next? Go and wait by the car we'd come in? But I couldn't remember whose car we'd come in, or where it was parked. I started to feel panicky...and then I woke up...