i have to agree with TA maureen as well. it does not take just a few days to get group rates as you have to see if the space is available, then get the contract, go over the contract, negotiate terms, etc...this is not done isntantaneously.
also, to be honest, if i had a client that changed their dates a bunch of times, it would really make me think twice about where to focus my time and energy....and i am NOT saying that vivrant_thing, you did not have good reason to change your date but i like to focus my energy on clients that are committed to their location as well as date. they are the clients that get my priority.
we get alot of people that contact us just to "kick tires"...i have even had people contact me before they got engaged for a wedding 3 years out..