Con friend

Somebody who you go to a convention with and doesn't care what you have to say or about you.

I don't want to hear your life story your just a Con Friend.

Con-Friends

Friends you have that you go to cons with, and/or meet up with at conventions.

I'm meeting my Con-Friends at the merch hall.

My Con-friends and I, are cosplaying characters from Tokyo Ghoul together.