In Greece, a vote is expected to happen on Sunday to decide what tax changes will take place. Protestors called an unexpected 48-hour strike that will begin on Friday and last through Saturday. This strike is in addition to the already scheduled protests that will take place on Sunday. Unions participating in the strike are demanding pension reforms. Metro operators that went on strike in Athens caused disruptions in public transportation.
See "Greece Hit by General Strike Over Pension and Tax Change", BBC News Online, May 6, 2016