Gravity Falls (the town) is probably so different now that Weirdmageddon is over.

The Society of the Blind Eye is gone, so they all remember Weirdmageddon, and they’re all scarred for life in some way or another.

Because everyone suffered through it, and everyone is scarred for life, the town becomes closer as a community.

They’ve probably started having apocalypse drills in town, in case it ever happens again.

They add paranormal studies to the curriculum in Gravity Falls schools, as a requirement, because now they know their town is super weird and people need to be educated to protect themselves.

They attempt to make the town even more isolated than it already is, because out-of-towners can’t handle the weirdness and they want to protect the rest of the world.

They initiate a Gravity Falls Independence Week, to celebrate the fact that they won Weirdmageddon (without actually talking about it, of course, because that would violate the Nevermind All That Act), they celebrate it every year starting on the day Weirdmageddon started, and ending on the day it ended.

The members of the Pines family are guests of honor during Gravity Falls Independence Week.

One of the traditions during Independence Week is burning nachos.