It is Friday and the end/beginning of the month.
There are often long lines at the ATMs in Centro, especially at locations with only one machine, but today was particularly remarkable. In some places it seemed as if people must be waiting in line for tickets to a show. Instead, they were a part of a sort of a show themselves. Look at how the procession is pushed out of the building, has curled around the corner, has already waited long enough.
Is this in Oaxaca by chance?