If two conventions are opposed are they contradictory? And if you have a mobster chairing the con is he the con Don? And if you go as vin deisel to a car convention are you a con Dom? And if you're going with your band to a convention and you loose the drums is that a con-none-drum. And if you find a nun to play the drums is that a con-nun-drum. And if you go to con certification isn't that a con-cert? And when you migrate a flag convention is that a conflagration.
Is a happy rapper convention from California con-yay west? Is a crossroads convention a con-junction?

Did I miss any?