Hersheypark in Pennsylvania could be forced to close this summer amid a dispute between the site’s operators and union employees, according to a report. ​ The amusement park is scheduled to open seven days a week starting May 21 in a shift from its weekend-only operation before the summer, despite a looming vote among employees about whether to go on strike. ​ Over 200 union maintenance employees at Hersheypark, The Hotel Hershey and Giant Center rejected a contract offer from Hershey Entertainment & Resorts on May 7, according to Inside the Magic . The park’s operators described the proposal as their “last, best and final” offer.​ Over a three-day period this week, employees will vote on whether to strike after rejecting the offer, which is the third from the park’s operators. A strike could close the park just in time for the start of the busy summer season when families head on vacation.…