System is down tomorrow night (9.30 PM ) only if you have infopass appointment tomorow i think you should be fine.
Our Case Status Online system, Change of Address Online system, processing times, and field office/Application Support Center/Civil Surgeon locator will be unavailable due to server upgrades from 9:30 PM on Friday December 7 until about 8:00 PM on Monday December 12.
In addition, our search engine and naturalization self-test will be unavailable due to scheduled server maintenance on Sunday Dec. 9, 2007, from midnight to 6 AM Eastern Time.