i don't think they mean "cooperation," i think this is right. it seems like an ironic street art project or something - an official sign likely wouldn't have a smiley like this - Ron Reason
It is ironic and no, not official. There are tons of people in the neighborhood who hate the tourists who come every year for this fiesta. But "colaboración" is the most common way to say "cooperation" in Spanish so it's a translation that's slightly "off".