No, we are operating the new 3-level system.........we, the region, have created the differentiation.
Well AWK, your region can carry on operating with your 3-level system, although reading the above it still looks like 4.
Meanwhile, let the regions that want to have a 4 level system do so, and include some events which are part of a nationally cordinated calendar. That way everyone can have an event structure that suits them. You can simply put all your regional events into just the lower level.