Modelling/Events and activities/Conferences

 Modelling

Documents — Index terms — Humans — Events and activities (Conferences) — Projects — Content uploads (Resource types)

SPARQL

PREFIX wb: <https://metabase.wikibase.cloud/entity/>
PREFIX wbt: <https://metabase.wikibase.cloud/prop/direct/>
SELECT ?item ?itemLabel ?when ?wikipage (GROUP_CONCAT(DISTINCT ?personLabel; SEPARATOR = ", ") AS ?persons) (GROUP_CONCAT(DISTINCT ?mainsubjectLabel; SEPARATOR = ", ") AS ?topics)
WHERE
{
?item wbt:P17 wb:Q22660.
OPTIONAL {?item wbt:P23 ?when}
OPTIONAL {?item wbt:P32 ?person} # leader, eg in a workshop
OPTIONAL {?item wbt:P33 ?person} # speaker, eg in a presentation
OPTIONAL {?item wbt:P19 ?person} # author, eg of a video
OPTIONAL {?item wbt:P11 ?wikipage}
OPTIONAL {?item wbt:P15 ?mainsubject}
  SERVICE wikibase:label {
    bd:serviceParam wikibase:language "en,sv,es".
    ?item rdfs:label ?itemLabel.
    ?person rdfs:label ?personLabel.
    ?mainsubject rdfs:label ?mainsubjectLabel.
  }
}
GROUP BY ?item ?itemLabel ?when ?wikipage
ORDER BY ?when

Try it!