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by sounds 4242 days ago
A QR code should be sufficient.
1 comments

But this requires every poster creator to add an ugly QR code. Plus, QR codes just take you to a website and then you have to add info to your calendar manually. Bonus points if they support .ics but that's rare.
No, you can create a QR code that encodes a calendar event. See example: http://imgur.com/117Jn9D