Sister to the term sausage fest, a cabbage fest is a Party, or Alcohol-Driven even mostly consisting of Female visitors, usually quite annoyed that there isn't a greater presence of Men around. Usually quite good for blokes though, as the chance of pulling has just gone very much in their way.
Girl 1: Oh girls, can't believe this, it's a cabbage fest in here!
Girl 2: Yeah, can't believe this!
Guy 1: Ey Ladies :D