Military vehicles and red carnations return to the streets and squares of downtown Lisbon on Thursday as Portugal reenacts dramatic moments from the army coup that brought democracy 50 years ago. Thousands of people are expected to attend celebrations of the so-called Carnation Revolution, which ended a stifling four-decade dictatorship established by Antonio Salazar. It also paved the way for Portugal’s 1986 entry into the European Union, then called the European Economic Community.