From the Scottrade Center’s website:
Van Halen, originally scheduled to perform on Sunday, October 28th, has been postponed due to a scheduling conflict. An announcement regarding the rescheduled date is expected sometime in the near future. All tickets for the postponed date will be honored at the rescheduled performance. Refunds are also available at the original point of purchase.
UPDATE: This show has been rescheduled. Click here for details.