Take the October SAT and come Saturday afternoon and Sunday. You'll still have the whole day and you'll be at the con by 2/3 on Saturday. Yes you might miss some things but life's hit and miss. And you're future's more important. This arrangement though g
Take the November SAT and go to NYAF/NYCC full out! This is your last year of freedom before college and you should live it to the fullest! Yeah, you'll have to put in extra effort this summer but who cares? It will pay off.
Take the October SAT and don't even go to NYAF/NYCC all together. Your future's way too important. Don't waste it at a con.