Tell me which is the world day that contains the word nations in it's name!
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q2558684 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'nations')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
world day: Q2558684