PREFIX core: <http://vivoweb.org/ontology/core#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

CONSTRUCT {
     ?location rdfs:label ?locationName .
} WHERE {
     PERSON_URI core:hasPresenterRole ?presenterRole .
     ?presenterRole core:roleIn ?presentation .
     ?presentation core:eventWithin ?containingEvent .
     ?containingEvent core:hasGeographicLocation ?location .
     ?location rdfs:label ?locationName .
}