Modify the DESCRIPTION of generated ical feed

tribe-events-calendar-pro-modevent.php

<?php

//Add to your theme's functions.php

add_filter( 'tribe_ical_feed_item', 'tribe_ical_modify_event', 10, 2 );
function tribe_ical_modify_event( $item, $eventPost ) {
	$searchValue = "DESCRIPTION";
	$fl_array = preg_grep('/^' . "$searchValue" . '.*/', $item);
	$key = array_values($fl_array);
	$keynum = key($fl_array);
	$mod = substr($key[0], 0, 1000);
	unset($item[$keynum]);
	$item[] = $mod;
	return $item;
}

?>