They did allow Turkish players to use free vacation mode during this month for one of their holidays! Then again the realm was down for repair for two days so this was sufficient.
there are many more turkish than US players at IO. That's a strong motivation for doing so.
more importantly, it was a religious holiday shared by many muslim communities in south-east europe, as well as around the mediterranean basin.
on the other hand, Thanksgiving is mostly a US holiday, and not necessarily religious.
Xmas or Easters are much more justified, since they'll be shared by many christian countries for example.
but you could still use the vacation mode with the free daily diamonds bonus.
Have fun,