France, April 25 -- The anniversary of the Carnation Revolution - named after the flowers protesters placed in soldiers' guns during the peaceful uprising - comes a month after the far-right party Chega more than quadrupled its seats in parliament, cementing its position as Portugal's third-largest party.

The highlight of the celebrations will be a military parade through central Lisbon featuring some of the roughly 5,000 soldiers who were part of the putsch, as well as around 15 restored military vehicles used on the day.

On April 25, 1974, the oldest authoritarian regime in Western Europe at the time fell within a matter of hours, virtually without bloodshed, thanks to an uprising by non-commissioned officers that was immediately back...