Legendary rock group The Who’s farewell tour faced an unexpected setback this week, just ahead of their upcoming Massachusetts show. Their Thursday night performance in Philadelphia was called off due to illness, according to a statement from the Xfinity Mobile Arena (formerly known as the Wells Fargo Center). The concert scheduled for Saturday night at Boardwalk Hall in Atlantic City, NJ was also postponed. Organizers advised ticket holders to keep their tickets while new dates are arranged.