Wasn't sure if this is a better fit on the Orienteering or Adventure Racing side, but the World Mountain Running Champs are taking place this weekend in Thailand, Nov 3-6.
https://wmtrc2021thailand.com/Believe there are 4 races: 80K and 40K trail races, the classic up and down event and the uphill-only mountain race (also called vertical climb).
A few Orienteers including some AP's are racing.
Story about the Canadian team is
here.