Well yeah, there's always the possibility that someone will take a vacation. But then, why sign up in the first place? It's a tournament. You know inherently that it's going to take months to complete and if they have vacations, they'll probably make time for it, if not let me know in advance as you have. I hadn't said a thing because at the time I was still scheduling and planning Round 1.
I wish I could make room and postpone the contest, but unless the majority is feeling the same way then you're the one who's going to have to try and compromise. Otherwise it wouldn't be fair to the other competitors.