Mount & Blade: Warband

Tournaments can be held in any big city at random times. Every couple days the tournaments in cities will end and more will appear in different places. You can enter any city and go to the arena to ask the arena master where tournaments will be held next. Make a save before you join a tournament as they're not too difficult but you never know when you'll be unlucky and get couch lanced in the arse or have to fight 5+ enemies yourself cause your team sucks but overall you shouldn't have a hard time winning. If you spawn with a weapon you hate, try hanging back and picking up a different weapon from someone who got knocked out.