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From the Model Mayhem FAQ:

How do I get emailed when someone is traveling to my area?
VIP members can subscribe to Alerts that will notify you if a Casting Call, Travel Notice, or Availability Notice matches criteria you choose. To create one, do a search for what you want to find, then click “Add to Casting Call Alert” on the results page. Give the alert a name and click submit. You’ll then get an email, a private message, or both when someone posts what you’re looking for.