"The galactic alignment" is a hoax. Sagittarius A* is the center of the galaxy. Can anyone figure out when the ecliptic passes right through Sagittarius A*? It would be such a gradual change into it, that making it one day is absurd. And I see no path of planets or luminaries that move over Sagittarius A*. Meaning there is no alignment in the near future, many many lifetimes.
The Mayan Calendar was given different dates for its ending decades ago, only in the past few years have they decided on this date.
What it is, is getting enough people to expect something. If enough people expect something, they may be able to "pull something off". They tried this with the Y2K bug, they predicted the Apocalypse like results with the Y2K bug. Enough people laughed, so they could not do anything.
That is all the usual suspects have in the cards: manipulation, lies, deception.