The date December 18th is when the Clasico may end up being played. Barcelona v Real Madrid, scheduled for October 26, could be moved.
The proposal to revert the fixture to the Santiago Bernabeu was not liked by either side, although has not been officially abandoned yet. There is another date, December 4, which is unlikely because Barcelona face Atletico on Dec 1.
If the game is played on the 18th, it is three days before Barcelona face Real Sociedad. The competition committee will have to decide what the outcome is.
The political situation in Barcelona is too tense, it seems, for the game to go ahead as planned next Saturday.