Warning: Do not try this at home. Or do. We're not our parents.
Step 1: Locate the exact spot where the apocalypse will occur. This is the most crucial part of the process, so don't mess it up.
Step 2: Mark the area with a series of precisely placed darts. This will create a sort of "dartscape" that will serve as a warning system for any potential doom-seekers.
Step 3: Repeat steps 1 and 2 until the dartscape is complete and the area is clearly marked as a no-go zone.
Voilà! Your doom-avoiding technique of choice is now in place. Pat yourself on the back, you clever individual.