PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX p: <http://www.wikidata.org/prop/>
PREFIX pq: <http://www.wikidata.org/prop/qualifier/>
SELECT DISTINCT ?series ?seriesLabel (Count(DISTINCT ?event2)as ?number_of_events)
WHERE{
?proceedings wdt:P31 wd:Q1143604;
wdt:P179 wd:Q27230297;
p:P179/pq:P478 ?volume_number;
wdt:P4745 ?event.
?event wdt:P179 ?series.
?event2 wdt:P179 ?series.
?series rdfs:label ?seriesLabel. FILTER(lang(?seriesLabel)="en")
}
GROUP BY ?series ?seriesLabel
ORDER BY DESC(?number_of_events)