Janet Jackson , who was scheduled to hit the stage in Boston, Massachusetts on Wednesday, has postponed the concert due to illness, her rep said in a statement on Tuesday. Jackson's stop in Philadelphia (October 2) will also be rescheduled while she recuperates. The Rock Witchu Tour will resume in Greensboro, North Carolina on October 4. The singer, 42, was due to perform in Montreal on Monday but canceled the gig after she "got suddenly ill" during her sound check and had to be rushed to ...