Today is a local holiday in Los Sauces, for the fiesta or Our Lady of Monserrat. Other than the day off work, it’s a purely religious festival. Tonight at 6:30 pm they’ll be a special mass in the church (the big church on the main square on the main street – very easy to find.) This will be followed by a procession with the statue of Our Lady, and then a loa.
A loa is absolutely nothing to do with the voodoo loas. In Spain, it’s a musical dialogue between two singers, usually dressed in costume. I believe at Los Sauces, they’re traditionally dressed as angels, and it’s very pretty.