We have something in the UK called "Rival Scenes" where all the locals face off in a 3v3 tournament across a bunch of games (and a mystery game tournament). Not strictly a local, but the local pride is BOOMING when you're there, so much shit-talking gets done and it really brings your local together.
There's some genuine rivalries too, with the multiple northern and Scottish scenes claiming ownership over Cody main, SoundBoi, North vs South, Scotland vs England, all sorts.
Worth a watch: