Tips on Customizing Timely All-in-One Events Calendar

How to Hide All-in-One Event Calendar by Time.ly Admin Menus

function plt_hide_all_in_one_event_calendar_menus() {
	//Hide the "Events" menu.
	remove_menu_page('edit.php?post_type=ai1ec_event');
	//Hide the "Events → Activate" menu.
	remove_submenu_page('edit.php?post_type=ai1ec_event', 'all-in-one-event-calendar-activate');
}

add_action('admin_menu', 'plt_hide_all_in_one_event_calendar_menus', 101);

Where do I put this code?

How to Hide All-in-One Event Calendar by Time.ly Meta Boxes

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

	//Hide the "Feed Subscriptions" meta box.
	remove_meta_box('ai1ec-feeds', $screen->id, 'left');
	//Hide the "Calendar Theme Options" meta box.
	remove_meta_box('ai1ec-less-variables-tabs', $screen->id, 'left');
	//Hide the "General Settings" meta box.
	remove_meta_box('ai1ec-general-settings', $screen->id, 'left');
	//Hide the "Timely" meta box.
	remove_meta_box('ai1ec-support', $screen->id, 'right');
	//Hide the "Widget Creator" meta box.
	remove_meta_box('ai1ec-widget-creator', $screen->id, 'left');
	//Hide the "Event Details" meta box.
	remove_meta_box('ai1ec_event', $screen->id, 'normal');
	//Hide the "Empower your calendar, build your community" meta box.
	remove_meta_box('ai1ec_event_features', $screen->id, 'side');
}

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