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.

Sentence: 'The Second Peace Conference was held from June 15 to October 18 , 1907 , to expand upon the original Hague Convention , modifying some parts and adding others , with an increased focus on naval warfare .', Argument/Subject 1: 'conference', Argument/Subject 2: 'june'
be hold in