Installed Forca Theme, wonder how I can alter Post editing screen

It sounds like you want register_taxonomy_for_object_type to add the taxonomy to the “Page” post type. 

register_taxonomy_for_object_type('events-cat','page');

As noted, I don’t know how you expect this to work. You are going to have to alter the page templates.

I would also suggest that you look into the Template Hierarchy, in particular the part about custom taxonomies. It sounds like you may be reinventing Core functionality.

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