CNN  —  Sunday, Monday, happy days. Fans of the beloved series “Happy Days,” which aired from 1974 to 1984, got a treat this weekend when some of the cast members came together at Steel City Con outside of Pittsburgh, Pennsylvania. Ron Howard, Henry Winkler, Anson Williams and Don Most joined a panel discussion about the series. The convention shared video from the event on their social media. The hit television show "Happy Days" was on the air from 1974 to 1984. Getty Images/File “We are very