An aerial view of Three Rivers Stadium. Photo: David Liam Kyle /Sports Illustrated via Getty Images One of the oddest games in Pittsburgh baseball history played out on this date 50 years ago. Flashback: Four-hundred concession vendors at Three Rivers Stadium voted May 21, 1976 to go on strike shortly before a Friday night game. Others opted against crossing the picket line, meaning there was more missing than hot dogs and peanuts.