To me a potluck is when everybody brings one important meal/dish that contributes to the entire idea of a potluck.  To have a proper potluck you need some steak, fish, rice, potatoes if you haole, beer, soda, water, juice.  I think that constitutes a basic potluck lunch or dinner.  Not this no such thing as water, juice and ONLY beer being served.  That’s some bullshit potluck.