I have a rather unique group for gaming, so we may be the exception to the rule. The group has 10 people: Me as the DM and 9 players. We game every other week Starting in October and ending in May. The rest of the year is off due to people wanting to do things in the spring and summer, and the fact that August and September we are all performers at a local Renaissance Festival.
The general rule for gaming attendance is that we schedule things so far in advance so as to make sure the most people can attend. The other major rule is that family comes first. If I find out you blew off something with your family to attend the game I would be very cross. I also ask that you contact me in some way if you are not going to attend. I will ask that you make sure I have a copy of your character, and we will try not to kill you when you are gone.
That being said, we have a rule that if we do not have quorum (which in this case would be five players) we will not play our usual game and will either cancel or offer to play something else. If we play something else others can be invited as well.
This system works well. We have a Google Calender, along with the calender in our Yahoo Group, so there are several places to verify gaming dates. This weekend is a gaming weekend. I have already been informed that one player cannot attend. He has been asked to be a puppeteer for a show called Transylvania Television (
The Retro Monster Comedy That's Really Not For Kids... check it out). He told me this yesterday and said he would arrange for his character sheet to be brought to the game. Another player will not be there because he is spending the weekend with his wife, because her birthday is this week. If he shows up I will send his butt home! We also have one player who cannot make it on a regular basis, but we bring his character along just in case he can make it.
For this gaming session we are at the balancing point. If one more player cancels we can still play, but everyone gets to play two characters. If two players cancel then I will call everyone and see if something else will be played, or if we cancel. It's no big deal to me. If we play, great! If we do not, oh well!
It is, after all, just a game.