From my COB experience, we never really tell the girls coming to our events how many spots we have open. However, we certainly wouldn't COB if we didn't have any spots at all! And I suspect that if we only had a couple of spots, only a couple of girls would be COB'd at a time. If a girl lost interest or was for some reason voted down, we'd COB someone else, but we wouldn't do a larger scale COB for a tiny amount of spaces. Did I make sense there?
I wish you luck. Seems like if they've voted you should know, but i'll keep my fingers (and toes) crossed for you!
