Purchase Opera Gems: An Evening of Opera's Most Treasured Masterpieces tickets for Mainstage at Union County Performing Arts Center in Rahway, NJ, scheduled for Sat, Sep 21, 2024 7:00 pm. With 148 tickets up for grabs, priced between $36.00 to $120.00 and an average price of $70.00, there's an option for every budget. Choose your ideal seat using our handy interactive seating chart.