He was invited to the Konigswinter conferences by Lilo Milchsack.

Entity and relation annotations:
id: 0
type: entity
value: text: Lilo Milchsack
labels: <Person>
id: 1
type: entity
value: text: Konigswinter
labels: <Location>
id: 2
type: entity
value: text: Konigswinter conferences
labels: <Event>
type: relation
to_id: 2
labels: Person:participates_in:Event
from_id: 0
type: relation
to_id: 1
labels: Person:visits:Location
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type: relation
to_id: 1
labels: Event:Occurs_at:Location
from_id: 2