I want to organize Atomic, Fog of War, Duck Chess, Spell Chess, Horde, etc. Arenas in my club

How should I do it, if possible? And if not, why not?

No idea I don't my own club.

make an announcement with times for arenas that you will make with these variants in your club

that's crazy!

In a good way?

then do it

It depends how many people are in your club and how many are supporting it