Kingdom War, KvK, and Kingdom Clash are names for the same Kingdom War: an entire kingdom versus a kingdom from another server.
It’s not a generic name for Alliance Duel, Elixir Scramble, and other events. They can contribute points toward Kingdom War, but they remain separate events with their own rules.
Don’t confuse Kingdom War with Royal City Scramble. In Scramble, alliances from the same kingdom fight each other for the Royal City and the title of king. In Kingdom War, every alliance on the server becomes an ally, and the opponent comes from another kingdom.
The schedule and safety rules are covered in “Kingdom War (Kingdom War / KvK)”.