It's game night and a bunch of players just canceled. All you have left are 1 or 2 other players. Do you cancel the game? NO!
Some of my best games have been with one or two players. Instead of your players having to wait their turn to announce their character's actions, they have all of your focus. My players love that and often consider those games their all-time favorites.
But what if the last game left off with a major boss battle and if only a couple characters show up they will be utterly destroyed? Yeah, don't put them in that situation! Have the game be a flashback, a flashforward, a flashsideways, a dream, or a hallucination in the blink of an eye. It doesn't matter. Hand-wave it and move on to the fun part, running the game.
Okay, but what do you run? I keep a few one-shot low-level modules on hand just for this occasion. A mid to high level character should be able to handle a low level module without trouble.
Also, some modules are built with the idea of having only one or only a couple players. I have had big success with The House of the Red Doors and The Moon King Wants to Party. Keep a PDF on your phone or the module in your referee's bag and the next time a bunch of players cancel keep the game going!
