Definitely use the bcc field!  Seems that these days folks don't understand that there is a difference between "Reply" and "Reply to All", or the general understanding of how a meeting is coordinated between a number of different folks.  I swear, I keep wanting to offer an class on basic Outlook "To-Do's/Not To-Do's" for our office just to get away from the stupidity of some of the stuff I see in this office.

Good luck on getting that meeting all straightened out!