query: SELECT ?item# ?sitelink 
  where
  {
     { ?item wdt:P1344 wd:Q8613 . }
    UNION
    {?item wdt:P1344 ?event .
    ?event wdt:P361 wd:Q8613 .
     }
    UNION
    {?item wdt:P1344 ?descipline .
    ?event wdt:P361 wd:Q8613 .
    ?descipline wdt:P361 ?event .
     }
    	OPTIONAL {?item rdfs:label ?item_label filter(lang(?item_label) = "en")}
  	FILTER(!BOUND(?item_label))
  	?sitelink schema:about ?item .
    #?sitelink schema:inLanguage 'en' .
  	FILTER EXISTS { ?wfr schema:about ?item . ?wfr schema:inLanguage "en" }
  }