cRPG is a modification for Mount & Blade II: Bannerlord. It adds persistent multiplayer character stats, hundreds of unique items, an online campaign, clans, duel ladder, a co-op game mode and a few more things.
A screenshot taken from the most recent donkey racing event.
There are several maps created for dedicated donkey/mule/horse racing events.
Interested in hosting a race? Speak to your regional Event Coordinator.