they will know - from what i can tell, the office folks keep pretty careful track of who comes and goes, and will probably put notes in your app.
Though to be sure, you could send a short email saying that you submitted in R2 and will be on campus on Feb 3 and would be happy to provide any additional info that they might need at that time. Of course, they don't actually need anything, but it would get hte point across without you actually saying, "hey, hey! I am coming...ok? Make sure you notice."
Does anyone have a better idea?