not showing custom type meta box

Try below code.

add_action('add_meta_boxes','create_events_metaboxes'); 
function create_events_metaboxes() { 
  add_meta_box('events-meta-box','Events Details','show_events_metaboxes','events-lists'); 
}

function show_events_metaboxes($post){ echo 'Hello Meta box'; }

Hope this will helps you.

Refer from add_meta_box