What is the {summit} for {participant of} of {Donald Trump}
Which summit did Trump participate in?
At what summit did Donald Trump participate in?
SELECT DISTINCT ?t WHERE { ?t rdf:type ontology:summit . resource:Donald_Trump property:participant_in ?t }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q22686> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1344> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1072326> } 
 select distinct ?obj where { wd:Q22686 wdt:P1344 ?obj . ?obj wdt:P31 wd:Q1072326 } 
2018 North Korea–United States Singapore Summit