minor update

assets/js/script.js

 	var location = $('#location').val();
 	var begin = $('#start-date').val();
 	var end = $('#end-date').val();
-	var filename = 'event.ics';
+	var filename = $('filename').val();
 	var cal = ics();
 	cal.addEvent(subject, description, location, begin, end);
 	//cal.addEvent(subject, description, location, begin, end); // yes, you can have multiple events :-)

layouts/events/single.html

           {{ .Content }}
         </div>
         <input type="hidden" id="subject" value="{{.Title }}"/>
-        <input type="hidden" id="description" value="{{.Content }}"/>
+        <input type="hidden" id="description" value="{{ .Params.calendar_description? .Params.calendar_description:.Content }}"/>
         <input type="hidden" id="location" value="Kolkata, IN"/>
         <input type="hidden" id="start-date" value="{{.Params.event_start_date }}"/>
         <input type="hidden" id="end-date" value="{{.Params.event_end_date }}"/>
+        <input type="hidden" id="filename" value="{{ .Params.calendar_filename? .Params.calendar_filename:.Title }}"/>
         <button class="clndr btn btn-main" onclick="downloadEvent()">
         <i class="ti-calendar"></i>Block Calender</button>
         {{ if site.Params.post_share }}