I think either Ravencroft or WALDO hosted something like that. Not sure though, since Ravencroft does the big basketball tournaments while WALDO does soccer.
meatsale hosted a football tournament and it crashed and burned.
Football is a very complicated sport and it takes a lot of time to learn all of the rules and know how to play. Waldo sometimes hosted pickup games with friends who had basic knowledge of the sport and it was a disaster because the refs and players had no idea what they were doing or how/when rules should be applied. Considered the majority of people here prefer videogames over sports I think it's safe to assume that most of them don't know the first thing about football.