How to set up group calendar, including link to download addon:
Addon is at: https://drive.google.com/uc?export=download&id=0BzejAmVDt2AcUmszUEszQWJQakU
Download it and enable it, then when you get in game you press the clock symbol by the minimap to get in the Calendar view. Go under Setup and cross "Use shared data channel", use Channel: Kraftig Password: Peace
Wait for the addon to syncronize to network (3 minutes), and after that you should be able to see the events. Everyone can put up events but please do not abuse this, keep it clean.
As for raid attendance: Put down if you're attending and you will be put as Standby for the raid. Before the raid (I will try 24 hours before) I will manually confirm those that are attending and who should remain on standby. Being on Standby means you're there at invite time or otherwise available through Discord. Failure to attend a raid that you've marked yourself "attending" on is a crime punishable by death!