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According to a note posted on Diddy's Facebook, these are the dates for open calls for "StarMaker".

San Francisco, CA
Saturday August 23rd 2008
Location TBD
Open Call Line 8am
Doors Open 9am

St Louis, MO.
Tuesday, August 26th 2008
Blueberry Hill
6504 Delmar in The Loop
St Louis, MO, 63130
www.blueberryhill.com
Open Call Line 8am
Doors Open 9am

New York, NY
Friday, August 29th 2008
S.I.R.
520 West 25th St
Between 10th & 11th Ave
NY, NY, 10001
www.sirny.com/studios
Open Call Line 8am
Doors Open 9am

Los Angeles, CA
Saturday September 6th 2008
Musicians Institute
1655 N. McCadden Place
Hollywood CA 90028
www.mi.edu
Open Call Line 8am
Doors Open 9am

Atlanta, GA
Tuesday September 9th 2008
Avatar Events Group
471 Glen Iris Dr NE
Atlanta, GA, 30308
www.avatareventsgroup.com
Open Call Line 8am
Doors Open 9am