Susan usually didn't like the big crowds, and a night at the pub normally qualified under that category. But if Bletchley was running this pub, and he was as 'in' with the Death Eaters as everyone said he was, then this was more of an undercover surveillance mission, and less of a social gathering.
When she put it into those terms, it wasn't such a bad thing. She was already in her coat and putting on her scarf when she heard the knock on the door. "Well aren't you the handsome one," she said as she gave him a kiss and admired his robes. "We don't have to dress up, do we?"