Question: When countries joined the location, that held the legislative session of the ,Seventh European Parliament?
Answer(s):

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:government.governmental_jurisdiction.governing_officials ?k .
?k ns:government.government_position_held.legislative_sessions ns:m.06zr1bt . 
?c ns:organization.membership_organization.members ?y .
?y ns:organization.organization_membership.from ?x .
}