The rapper will play Halifax December 10, while the singer-songwriter returns to town in January. . When the arrival of Hurricane Fiona caused its own flurry of cancellations, it meant concerts by both up-and-coming MC superstar JPEGMAFIA and singer-songwriter Can-con queen Sarah Harmer had to be cancelled. The former was slated to come to Halifax as headliner for Hopscotch, the largest hip hop festival in eastern Canada…