KEY TAKEAWAYS

Anson Williams, Donny Most and Henry Winkler will attend Salt Lake City's FanX.

The "Happy Days" cast will participate in a Q&A panel and sign autographs.

FanX runs from Sept. 25-27 at the Salt Palace Convention Center in Salt Lake City.

SALT LAKE CITY — It took a pack of teenage girls hounding his limousine for Anson Williams to recognize the weighty impact "Happy Days" was having on the nation.

Both Williams, who played Potsie Weber on the sitcom, and Donny Most, who played Ralph Malph, recall working long winter days while filming the first season of "Happy Days." They left their houses during the dark, early hours of the morning and returned home after the sun had set.

It was 1974. Social media wasn't around to provide an indication of the young actors' burgeoning f

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