Long shot but shuttle service from and to the airport?

The hotel does not have a shuttle service to and from the airport, but I know there are Marta trains from the airport that drop you off a few blocks away from the hotel. I’d check those out

What Martin said. The Tech Trolley also can bridge the last couple of blocks between the marta station and the conference center. Not sure whether the tech trolley is terribly accessible if that's a concern but it does include both as stops on its route.