A potential strike by more than 200 unionized maintenance workers may keep Hersheypark from opening for the summer season on time. Workers at the Pennsylvania park, The Hotel Hershey and the Giant Center rejected what Hershey Entertainment & Resorts described as its “last, best, and final” contract offer on Thursday after months of negotiations, according to union officials. News of the labor impasse was first reported by the Disney-centric site Inside the Magic. The stalemate sets the stage for a union vote authorizing a three-day strike this week that could impact operations across the sprawling resort complex — days ahead of the scheduled May 21 start of the summer season. Hersheypark faces a potential strike by more than 200 union maintenance workers ahead of its busy summer season. LP Media Pennsylvania’s biggest amusement park has been preparing to transition from weekend-only operations to a seven-day-a-week schedule ahead of the busy Memorial Day holiday rush.…