Auto-translated
Holding an offline tournament based on one of the campaigns, as you suggest, is not a good idea, as your concept for conducting tournaments of this genre has already been implemented and explored extensively in numerous instances on other online resources dedicated to Heroes of Might and Magic.
In light of this, I propose the following approach for conducting this large-scale tournament:
1. A save file for the first campaign, "New Beginning," is generated.
2. All participants play using only this save file!
3. After completing the first map, the winner is determined, and their final save file is used to create the next save for the second map of the first campaign, and so on, until ALL CAMPAIGNS are completed! This is a very important point!
4. Thus, all campaigns from "The Shadow of Death" must be completed. Based on the results, a winner must be determined! It is simply not possible to choose just one campaign!
Sincerely, VDV_forever