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apparently, I was mistaken; I couldn't find any logs for HD+ regarding weekly/monthly monster events. I don't remember having weekly/monthly monster events in my playthroughs – in Paragon, for example, there was a significant issue deciding which creatures to use for demonizing, even though many months passed.
And in online games, they are definitely technically prohibited in both HotA and Heroes of Might and Magic.
But I found where I got this idea from – these rules were used in offline tournaments that I participated in.
More precisely, not just the rules, which could change from tournament to tournament, but they were removed from the executable file used for these tournaments (HOMM Tournament Edition or TE version).
And in online games, they are definitely technically prohibited in both HotA and Heroes of Might and Magic.
But I found where I got this idea from – these rules were used in offline tournaments that I participated in.
More precisely, not just the rules, which could change from tournament to tournament, but they were removed from the executable file used for these tournaments (HOMM Tournament Edition or TE version).