All the clans can have a chuunin exam round 3 thing. 1-3 members can go to a tournament like event, like a three man cell. You choose which kind of tournament to enter based on the rank of the nin you send ie; 1st division AcS-genin, 2nd division chuunin, 3rd division jounin-hunter nin, 4th division anbu-anbu captain, dream division sannin, nightmare division kage+. The tournament would need jutsus when they fight each other too, what's a tournament without jutsu? The winner's clan gets a trophy/ hall of fame, and the compeitors should also get some kind of reward of their choice like a new title to go along with their accomplicement (can't spell) or some kind of boost with stats or gems, or even acess to some kind of area. Your choice.