Yes, the Houston, Texas date has been canceled. Here is the information from the Panic at the Disco fanclub:
We regret to inform you all that the November 14th date of the Rock Band Live Tour in Houston, TX has unfortunately been CANCELED. Due to costs from Hurricane Ike and attempts to make scheduling changes, this event can no longer take place. Please visit your point of buy for refunds.
March 3rd, 2010 | 
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CHECK – WWW.STUB HUB .COM
( THEY’LL BEABLE TO TELL YOU THERE )
Yes, the Houston, Texas date has been canceled. Here is the information from the Panic at the Disco fanclub:
We regret to inform you all that the November 14th date of the Rock Band Live Tour in Houston, TX has unfortunately been CANCELED. Due to costs from Hurricane Ike and attempts to make scheduling changes, this event can no longer take place. Please visit your point of buy for refunds.