This is from the Market's website:
Market to Open Sundays
Beginning October 15th
Reading Terminal Market will begin opening on Sundays on a trial basis beginning on Sunday, October 15th. Hours of operation on Sundays will be 9:00am to 4:00pm. Each individual merchant will decide whether or not to open at his or her option. As a consequence, not all merchants will be open, in particular the Amish.