right now, generating the 'subscribe link' creates a very long http-link-text. For more convenience for the users, we should:
a) create a directly clickable webcal:// or webcals:// link right besides it (maybe with a calendar icon?). That would allow users to actually click on it and let the Browser/OS redirect to subscription options (an app on mobile, maybe thunderbird / webcalendar on desktop..., If you don't have a clue, like so: http://icalshare.com/calendars/2).
-> Suggestion: also keep the currently displayed string as it is now, for the more 'power users...'
b) from the same link as in a) create a qr-code (maybe via qrcode.js?). This would allow users to simply scan the link with their phone rather than typing in this enormous string (with authtoken, etc...)