Tell your friends and tell your family. It is time for us all to make plague doctor costumes. Everyone needs to build these and walk around their city/township at night scaring the bejeezes out of everyone.
It is not necessary to speak, just wander. Stand outside and stare into the windows of local shops while people are buying items. Stay in dimly lit areas, behind bushes or fences. Allow certain people to see you but only for a moment and find ways to dodge out of view by using the terrain or the city as your camoflauge.
Here is a visual tutorial on how to create your own mask(and some extra plague doctor images):