Here you'll find many Campaign Materials of the World PI Week, including general materials, materials for the 2018 World PI Week and those of past campaigns.
Which materials are you looking for?
Translations of these materials (including advocacy materials) in various languages are available in the "local resources" section.
You can also read the report of the 2017 campaign here.
The official World PI Week video is available here (English, with subtitles in French, Spanish, Portuguese and Russian).