For DnD, I normally aim for six players, and I run if there’s at least four present.
Knowing that the game will go on anyway without you is really good motivation to not flake out (I speak as someone who flakes out a bunch.) - and DnD is a very easy game to just have someone be not present for a week.
Yesterday, one of my players just plain forgot that we scheduled a game.
Luckily, the party was split up doing downtime activities anyway, so we decided that they simply could not locate that character quickly (time was somewhat of the essence). Near the end of the session, the party realized that they need that particular character’s alchemical expertise, giving them a great reason to actually go look for him.
In the face of death does true heroism show, or cowardice.
“Many fall in the face of chaos…but not this one. Not today.”
Our DM (who is awesome and cool) has 2 campaigns going:
The main one for if we all are there
An episodic, side campaign if 1 or 2 people are missing