I was at someone else's meeting last week that was a disaster...complete and utter disaster. The meeting was called, calendars (of busier people than me!) were cleared, an agenda was sent, but only a few people showed up.
We were all there in person, but only half the group was there -- prepared, ready to participate, and with an intention to collaborate. They showed up but didn't.
Made even worse by the fact that the meeting convener didn't show up either. I mean really.
It would have been better for him to cancel the meeting than actually hold it when he wasn't prepared. Instead of an empty 2 hours on the calendar, now he has at least 4 people who won't bother showing up (in any sense of the word) next time.
Show up. Come prepared -- read the material, know why the hell you're in the room, have a point of view, at least come with your calendar so that you can discuss schedules.
Don't waste your time. Don't waste mine either.
(p.s. you can buy this tshirt at zazzle)