The NBC drama was cancelled earlier this year, but rumours began to circulate that Syfy was considering ordering a miniseries or a TV movie to wrap up the show.
Syfy denied the speculation but last month NBC's chairman Robert Greenblatt suggested that a film is still possible.
Ritter has now told TV Line that he isn't sure about the status of the project but would happily sign up to return to The Event.
"I'm waiting to get a phone call either way," he said. "[Producers] Nick Wauters and Steve Stark are still talking to people and trying to get it done. Every cast member I've talked to is interested. And I personally would love to at least finish that story up."
Ritter is currently working on the new season of Parenthood, while his co-star Laura Innes recently joined the cast of NBC's new midseason drama Awake.