"job Shadow" for FOH manager upscale restaurant?

I have finished a second interview of aposition with the Melting Pot as the front of the house manager. I was asked if I would be interested in shadowing for a night to really get a feel for the position before they pick between the last 3 of us interviewing. I accepting - partly bc I just thought it would be fun - but now its the night before and I dont have a clue what to expect and I'm really really nervous! What do you think it would be like? Will they expect me to "do" anything??? I'm not an employee, but I know theyll want to see what I can do.... What do you think?!