You got Grego if an inside venue is cancled it is cause the act/band has cancled the weather never really cancles
I think you will have to call the venue if the event is cancelled. Sometimes they may express it on the news or an email may be sent.
I would assume the venue you bought the tickets through would email you or contact you somehow to let you know i know ticket master offers some type of insurance but not sure if inclement weather is included in that insurance and it has to be purchased when the tickets are purchased
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