Nope, sorry, but the fact that they are having a meeting with everyone is only a sign that they think that they can 'persuade' you better if they have 100 bodies in the room all in opposition to you.
While I generally agree, the other thing that I point out is that this is also an opportunity to have high level decision makers at the table. So yes, expect to try to be persuaded but recognize that you may also be able to turn the tables. In fact, in our situation we had to get past the G/T teacher to the admin level to get what we were looking for. It wasn't pretty, but it was necessary.
Good luck!
JB
