Check out the "OnStage!" graphics... I'm not sure they advertised that in early 2001, so it had to've been the later months.
I'm guessing they replaced it somewhere between 6-4-01 and 9-4-01.
*EDIT* The timestamp on the "red" sign reveals it was taken: 6/9/01 at 2:37 PM. So, it was changed between 6-4-01 and 6-9-01.