Another suggestion:
Rather than calling up and asking, "How do a bunch of us gamers all get to stay on the same floor?" to which they reply with a rather lame plan to get everyone to file requests (?), try a different tack. I've worked in the hospitality industry, and this is their way of telling you not to bother.
So here's what you do: call them as the representative of EN World, a premier membership organization that is "considering" sending a delegation to the RPG Conference, and staying at Embassy Suites. Tell them you can promise (X) amount of reservations--this thread gives you a good idea of the interest--and ask them what kind of discount they're willing to offer if you reserve the block of rooms for the members of your organization.
They are making it harder for you to guarantee them a large amount of reservations. That is dumb on their part. If you present it to their Sales Manager (NOT the front desk/reservations staff) as I've written above, I'm willing to bet the reaction will be different.
p.s. You also won't have to make reservations 6 mo. in advance. That's just beyond surreal.
This is something I'd like to see happen, but I really don't have the kind of experience required to make it happen (knowing who to contact, what to say, what to arrange, etc).
