I was wondering if I can walk-in to the USCIS application support center to do fingerprinting before my designated appointment date? My appointment is 6/3, but I cannot make it on that day, because I will be out of state... I've been trying to change my schedule, but it did not work out... So I am planning on walking in on either 5/26 or 5/27 and get this done earlier than 6/3? Is it possible? Will there be any disadvantages if I take this step early? Thank you so much! Truly appreciate it.