N-400 Interview Notices for Saturday and Sunday - They are NOT Wrong!
On March 20, 2008, the USCIS announced that is expanding work hours and adding staff to complete processing N-400 naturalization applications. It’s doing this because it has received a significant increase in N-400 applications and it wants to complete the processing of them within its announced processing times.
Therefore, if you get an interview advising you that you have a received a notice from the USCIS that your naturalization interview has been scheduled on a Saturday, Sunday, or after usual business hours, don’t assume the notice is wrong. In fact, the notice is correct and you must appear at the scheduled time.