1. Where can I find out when and where servers are being chosen for Free Server Migrates?
- Blizzard announce them on the forums everytime they made a "Free server transfer" available for specific realms
2. Is it something written in stone like the Darkmoon Faire? (every start of the month)
- Nop. We never know when they are going to give us a "Free server transfer", they are announced on the forums.
Never wait for "Free server transfer" because they are really rare and specific, you will never know when is going to be available a free server transfer for EU Kazzak, you better pay for the transfer if you really need it.
Blizzard only made them available because of technical difficult on a specific crowded realm