Login as admin. click on the month in a calendar block. on the resulting page click on "manage subscriptions" Add a calendar, you can use this url http://ical.mac.com/ical/US32Holidays.ics on the resulting page, make sure the update and remove buttons are "<button>" tags and not "<input>" After the import is done, trying changing the "update" frequency and click on update. Make sure the update works. Click on "remove". Make sure it works. Repeat all above steps in two other languages besides English including one RTL like Hebrew.