Unless there is something different they have to do an "early" FP, I would recommend to just show up around 11:00 AM and present them your FP notice. Do not try to explain upfront that your date is 10/20. See what happens. If they object and tell you to come back on the scheduled date of 20th, then try to explain your reasons why you want to do it early.
As belacut pointed out, there is not much load in the Columbus office, there is a good chance that they will let you do it before the scheduled date.
I recommend 11:00 because a few of my friends went at that time and there was absolutely no finger printees. Also at that time, more than likely the supervisor for the FP section would have gone thru his morning emails etc, and you might be able to talk to him and get him to accept your early FP if the persons at the front desk don't let you do it.
A little off topic: a friend of mine and his wife got FP notices for two different dates; but they both went on the first scheduled date and they did them both with out any question.