Tips on Customizing Quick Event Manager

How to Hide Quick Event Manager Admin Menus

function plt_hide_quick_event_manager_menus() {
	//Hide "Settings → Event Manager".
	remove_submenu_page('options-general.php', 'quick-event-manager');

	//Hide "Events".
	remove_menu_page('edit.php?post_type=event');
	//Hide "Events → Events".
	remove_submenu_page('edit.php?post_type=event', 'edit.php?post_type=event');
	//Hide "Events → Add New".
	remove_submenu_page('edit.php?post_type=event', 'post-new.php?post_type=event');
	//Hide "Events → Categories".
	remove_submenu_page('edit.php?post_type=event', 'edit-tags.php?taxonomy=category&post_type=event');
	//Hide "Events → Tags".
	remove_submenu_page('edit.php?post_type=event', 'edit-tags.php?taxonomy=post_tag&post_type=event');
	//Hide "Events → Registrations".
	remove_submenu_page('edit.php?post_type=event', 'qem-registration');
	//Hide "Events → Premium Reports".
	remove_submenu_page('edit.php?post_type=event', 'qem-premium-reports');

	//Hide "Event Attendees".
	remove_menu_page('qem-registration');
	//Hide "Event Attendees → Registrations".
	remove_submenu_page('qem-registration', 'qem-registration');
	//Hide "Event Attendees → Premium Reports".
	remove_submenu_page('qem-registration', 'qem-premium-reports');
	//Hide "Event Attendees → Email to Attendees".
	remove_submenu_page('qem-registration', 'qem-email-attendees');
}

add_action('admin_menu', 'plt_hide_quick_event_manager_menus', 1000000000);

Where do I put this code?

How to Hide Quick Event Manager Meta Boxes

function plt_hide_quick_event_manager_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Event Details" meta box.
	remove_meta_box('event_details', $screen->id, 'normal');
	//Hide the "Event Description" meta box.
	remove_meta_box('description_section', $screen->id, 'normal');
	//Hide the "Event Registration Form" meta box.
	remove_meta_box('event_registration', $screen->id, 'advanced');
	//Hide the "Registration Confirmation Message" meta box.
	remove_meta_box('registration_confirmation', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_quick_event_manager_metaboxes', 20);