Hi Yongma,
I will have an interview in Santa Ana office soon, let me ask u a quick question.
After the interview did you ask an officer to have the same day both ceremony? Or officer asked you that?
I didn’t ask for it, but it seems like if you have a weekday interview you will have your ceremony on the same day (within a few hours). My interview was on a weekday and I walked to the ceremony room right after my interview. Not sure if there are days where they don’t do the ceremony.