The day a dictatorship was overthrown by red, but not by blood.
The wiki is pretty accurate, according to my grandmother: https://en.m.wikipedia.org/wiki/Carnation_Revolution
Do keep in mind that there was a small amount of bloodshed. In the last hours, the government was holed up inside the National Guard building. This was quickly surrounded by military and a mob. The loyal troops/secret police that were holed up inside did start shooting at the crowd below, killing 3. Then one of the workers inside said building surrendered to the military. Said worker apparently panicked and tried to run away. One of the troops ran after him, the other fired their rifles, mortally wounding both