RPG Maker MV Tutorial #26 - Common Events PART 1
Common Events are like a familiars that you can summon at any moment. Not only can you summon them at any time, but you can also customize all of their attributes and change what they have done and will do in the future.

If you ask me, they're pretty convenient. Almost as convenient as a YouTube video description generator. Unfortunately, there does not appear to be one in existence. There might be, I haven't checked. I'll go do that now.

I checked. It doesn't exist.
*insert sad face here*