If I am not wrong, tournaments were open for non-subscribers after Christmas. If that is true, have the special treatment during Christmas season been removed?

There was some message about allowing non-subscribers to have 12 games open at once during Christmas time also. Has that too been taken away?

Hiya.
Have a look at the announcements forum for details, but the summary is that it was: "a small number of non-sub tournaments", posted on 3rd December. It looks like you missed the boat.
You have a choice of paying some money, or waiting 'till next year to see if the same offer appears. If you've come back to play some more, the money is probably worth it.
Gezza