The State Department has updated its page about Demonstrations in Spain.
According to the State Department "Demonstrations are commonplace in Spain. They may range in number from a few people to several thousand"
They warn of demonstrations in Madrid from the 28th to the 5th of Oct. and the 29th to the 7th of Oct.
So if anyone wants "To protest against the 'unpleasant smells of the neighborhood at Butarquey & Perales'" you've got a date the 4th in Plaza de Cibeles at 18:00