This simple script, corrects moodle iCal utf-8 characters , if you are not Admin and not able to access and correct it on server ! see more here: https://tracker.moodle.org/browse/MDL-30756 how to use: replace $url value to the buggy iCal url, place this file in a self hosting site (your own site) for example: www.yoursite.com/moodle-ical-correc…

moodle-ical-corrector.php

<?php 
	setlocale(LC_ALL, 'fa_IR'); //set your locale https://gist.github.com/jacobbubu/1836273
	header('Content-type: text/calendar; charset=utf-8');
	header("Cache-Control: no-cache, must-revalidate"); 
	header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); 
	$url = "http://moodle/buggy/ical/url"; //link to moodles iCal
	$badstr = file_get_contents($url);
	echo iconv("utf-8", "utf-8//ignore", $badstr);

?>

moodle-ical-corrector2.php

<?php 
       //Update: if you can not use file_get_contents()
       //or iconv() returns blank string (in new php versions),
       //then use this code:
       
	setlocale(LC_ALL, 'fa_IR'); //set your locale https://gist.github.com/jacobbubu/1836273
	header('Content-type: text/calendar; charset=utf-8');
	header("Cache-Control: no-cache, must-revalidate"); 
	header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); 
	$url = "http://moodle/buggy/ical/url"; //link to moodles iCal
	$ch = curl_init();
	curl_setopt_array(
		$ch, array( 
		CURLOPT_URL => $url,
		CURLOPT_RETURNTRANSFER => true
	));
	$badstr = curl_exec($ch);
	ini_set('mbstring.substitute_character', "none"); 
	echo mb_convert_encoding($badstr, 'UTF-8', 'UTF-8'); 
?>