Any Issue with VFR Traffic? Pattern or practice maneuvers in the Bravo?
I can't speak for ZKC, but I can speak generally:
If it's permitted on network (which it is), it'll be permitted during events. We don't get to redefine VATSIM for an event. Be courteous, though. Transiting or departing/arriving? Have at it. Pattern work? Would you really want to do that there, anyways? Wanting to maneuver inside? They'll get busy, and you may be operationally restricted to the point where it won't be fun to be there for you or them.
It may just be easier and friendly to sit just underneath the shelf. You can watch the lines of airplanes from there without any of the complications. If you do this, just remember to actually remain clear of airspace or you may find yourself on the wrong side of a wallop.