I've instituted No-Slogan Week (International). It starts the first Monday in August every year. The goal is to eradicate all and every slogan on the planet.
It'll be run by No Slogans Limited, and its slogan is "No slogan is too big or too small to be eliminated".
It has a subdivision, No Slogans Unlimited, which has the goal to make every government in the world officially recognize No-Slogan Week, and has the slogan "No slogans anywhere, on every wall and every desktop in the world".