I just wanted to jump in and show some support - what an awful thing for you to have to deal with! On top of the stress of the upcoming day, and the monkey-wrench that this throws into your planning, you have to deal with the fact that 2 of your closest friends totally let you down. I'm so sorry
I've been on the boards a short while, but every time I've posted a question or had a frantic moment, you've always posted a tip, idea, or word of encouragement - and I'm practically a stranger! I can only imagine how well you treat your close friends...you deserve better!
I'm sure it will work out for you. I agree with some of the other girls who suggest you have 2 GM's escort each BM - I've seen it done before and it looks cute.
No matter what, I know it will be great b/c you've worked so hard planning and b/c you are marrying the man you love!!!