This is all the information that I have found. Head to the NBC site for more details.

Team West Coast can go to calls in Seattle on July 1, Salt Lake City on July 8, Denver on July 15, and Los Angeles on July 22.

Team Midwest calls are in Minneapolis on July 1, Chicago on July 8, St. Louis on July 15, and Des Moines on July 22.

Team East Coast calls are in Boston on July 1; New York City on July 8; Norfolk, Virginia on July 15; and Columbus, Ohio on July 22.

Team South calls are in Jacksonville on July 1, Atlanta on July 8, Nashville on July 15, and Houston on July 22.