I really think you are going to have a hard time finding anyone who is going to want to stand and man a booth the night before a marathon. You probably should put what is expected out of the person, like what time they would be done, if they would have to take the booth down that night and stuff like that. I know that Steve did a booth last year and didn't have that great of a race becuase of the stress and late night he had that night.
I also think it should be maned by the person who knows the Fast Running Blog the best