Extend the CSV export option of The Events Calender https://nielsvr.com/2015/12/07/extending-the-events-calendar-attendees-csv/

custom_csv_event_calender_pro.php

<?php

  add_filter('tribe_events_tickets_attendees_csv_items', 'filter_eea_csv_items', 10, 1);
	
	function filter_eea_csv_items( $items ) {
		
		$first = true;
		
		foreach( $items AS $item_row => $item ) {
			
			if( $first ) {
				
				$items[$item_row]['billing_address'] = "Billing address";
				$items[$item_row]['shipping_address'] = "Shipping address";
				$items[$item_row]['user_skype'] = "Skype";
				$items[$item_row]['user_birthdate'] = "Birthdate";
				$items[$item_row]['user_diet'] = "Diet";
				$items[$item_row]['user_room'] = "Room";
				
				$first = false;
				
			} else {
				
				$order_id = $items[$item_row][0];
				$order = new WC_Order($order_id);
				
				$billing_company_position = get_post_meta( $order_id, "billing_company_position", true );
				$billing_company_position = get_post_meta( $order_id, "billing_company_position", true );
				$billing_address = $order->get_billing_address()."<br/>".$billing_company_position;
				
				$shipping_address = $order->get_shipping_address();
				
				$skype = get_post_meta( $order_id, "user_skype", true );
				$birthdate = get_post_meta( $order_id, "user_birthdate", true );
				$diet = get_post_meta( $order_id, "user_diet", true );
				$room = get_post_meta( $order_id, "user_room", true );
				
				$items[$item_row]['billing_address'] = $billing_address;
				$items[$item_row]['shipping_address'] = $shipping_address;
				$items[$item_row]['birthdate'] = $birthdate;
				$items[$item_row]['diet'] = $diet;
				$items[$item_row]['room'] = $room;
				
			}
			
		}
		
		return $items;
		
		
	}