Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Example: Sentence: 'Harry glanced again at the raw looking thing that trembled and choked in the shadow beneath the distant chair.', Argument/Subject 1: 'Harry', Argument/Subject 2: 'raw looking thing'
Example solution: glance
Example explanation: The sentence contains the generated relationship - glance, mentioned between two subjects - Harry and raw looking thing

Problem: Sentence: 'Held at the Minneapolis Convention Center , the second annual expo included hundreds of exhibitors , many free workshops and fun special events .', Argument/Subject 1: 'workshop', Argument/Subject 2: 'center'

Solution: be hold at