They journey south to welcome the dead and then they go back to the U.S.

It’s unclear exactly how many go back, but experts say that some tiny villages swell in size. Immigrants who cannot travel often send money to those planning the festivities, said Xóchitl Flores-Marcial, a Zapotec historian at Cal State Northridge, who compared the season to Thanksgiving travel.

https://www.theyucatantimes.com/2021/11/they-journey-south-to-welcome-the-dead-and-then-they-go-back-to-the-u-s/

The Yucatan Times, Mexico