Back when we first started raiding, we made a decision to never raid on Tuesday nights - there was always a risk of a bad maintenance day. Somewhere along the line (when Ulduar was coming out) we got away from this rule and added Tuesday to our Sat/Mon lineup.
Last night we got bit.
Our battlegroup was down for emergency extended maintenance for about 3 or 4 hours. Go us. A lot of us messed around with alts on another server, but at the end we had to cancel our raid in favor of another night. Who knew it'd be this big a challenge to reschedule.
It seems our raiders really do have lives after all, since we can't get a good consensus on when the best night to raid would be. People have scheduled work/Significant Others/family, etc around these days. It's pretty unfair of us to expect them to change at the last minute, especially when we try and run a loose ship anyway.
So now we're going in on Friday (canceling our 10 mans) since it seems to work best for those involved. With any luck we'll have enough of our core raiders on to at least clear the early content, and maybe we'll be able to try out some new recruits at the same time. Who knows - this might just work out for the best in the long run.