1106
Counter - demonstrations in support of the US - led invasion of Iraq took place in some cities , with some 2 , 500 people turning out in Chicago .
 None
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: demonstrate 
  Option: entity, place 
Text: {0} 
Answer:
 None