We got to Mexico during Holy Week, Semana Santa, and it's a big deal here. School is off for Semana Santa and the following week, many places are closed during Holy Week, and there are lots of festivals. We went to the Viernes Santa procession in historic downtown Morelia and learned how the KKK came up with their outfits (or at least a theory).
Capriote, the hood, has a long religious tradition and perhaps the KKK was appropriating it from the Catholics they hated? https://en.m.wikipedia.org/wiki/Capirote
The procession used to be (at least more) silent and solemn, but now it's bordering on a parade. The sales officially stop (or at least move away from the street) during the procession.
The next day we witnessed an old Semana Santa tradition, people dressing up as a bull and other "scary" creatures to scare people into confessing their sins and restoring/claiming faith during Holy Week. I don't know how long ago it stopped being scary, but it was definitely captivating!