Just HOW crowded will 2/15 and 2/16 be?

[missnic]

I'm trying to get an idea of just how bad crowds will be. My main goal is to see barenaked ladies (all time favorite!) On Sunday, and possibly some of the HP stuff on monday. Im not overly concerned with doing everything - we'll probably buy annual passes and come back at a way less crowded time. We may not get to the park until mid afternoon on Sunday, so what can I reasonably expect to get done between then and the concert, and on Monday?