for anyone on holiday during this period there will be problems as part of the rail network from the airport to town will be closed. there will be replacement busses every 15 minutes to and from the airport and sants.
trains from blanes etc will not go to placa catalunya but will instead stop at Estació de França.
see timetable R1
a map showing the affected area is here
this will obviously impact on anyone wanting to get the train from the airport to one of the resorts, and will also affect anyone going to barca for a day out.

they must have employed someone from our governments transport department to advise them