An extension of pre-defined setups of scenarios from the WBC and others has been added to the CC:E page: https://vassalengine.org/wiki/Module:Combat_Commander:_Europe
The WBC and the Training Day scenarios can be found on GMT’s website: https://gmtwebsiteassets.s3.us-west-2.amazonaws.com/combatcomm/WBC_Combat_Commander_Scenarios.zip
If you know of other conventions that you’d like to have added to this extension, please let me know. I have reached out to a PrezCon and CanCon about adding their scenarios to this extension, I’m waiting to hear back from them.
As always, the Combat Commander ladder offers chances to play daily! More info on the ladder here: The Combat Commander Ladder | Combat Commander Vassal Tournament Guild