query: SELECT ?item ?itemLabel 
  WHERE 
  {
    ?item wdt:P31/wdt:P279* wd:Q464980 .  #exhibition
    {?item wdt:P276/wdt:P279* wd:Q1782422 .}
    UNION {
    ?item wdt:P276 ?locatie .
    ?locatie wdt:P466 wd:Q1782422.
    }
    UNION {
     ?item wdt:P664 wd:Q1782422.
    }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "nl,en". }
  }