Merlin had decided to get out and about that evening, and spend time milling about with the rest of humanity, in a place that wasn't his club. He deserved a night off every once in a while too.
Diogenes seemed the obvious fit. He enjoyed the aesthetic of the place, and one really couldn't know who exactly one might bump into.
For instance, Friar Tuck.
He looked up from the book he'd pulled off the shelf and smiled at the man, his quick eye taking in Tuck's appearance. He closed the book, placed it down, and gestured to the seat opposite.
"So. You made it out," he said with a slight tilt of his head, picking up his glass.