Tips on Customizing Spiffy Calendar

How to Hide Spiffy Calendar Admin Menus

function plt_hide_spiffy_calendar_menus() {
	//Hide "Events".
	remove_menu_page('edit.php?post_type=spiffy_event');
	//Hide "Events → Events".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'edit.php?post_type=spiffy_event');
	//Hide "Events → Add New Event".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'post-new.php?post_type=spiffy_event');
	//Hide "Events → Categories".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'edit-tags.php?taxonomy=spiffy_categories&post_type=spiffy_event');
	//Hide "Events → Settings".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'settings');
	//Hide "Events → Themes".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'theme');
	//Hide "Events → Front End Submit".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'frontend_submit');
	//Hide "Events → Custom Fields".
	remove_submenu_page('edit.php?post_type=spiffy_event', 'custom_fields');
}

add_action('admin_menu', 'plt_hide_spiffy_calendar_menus', 11);

Where do I put this code?

How to Hide the "Event Details" Meta Box

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

	//Hide the "Event Details" meta box.
	remove_meta_box('spiffy_event_meta', $screen->id, 'normal');
}

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