1117
Protesters also gathered in their thousands in Halifax , Calgary , Edmonton and Vancouver .
 Halifax: place; Calgary: place; Edmonton: place; Vancouver: place; Protesters: entity
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:
 Halifax: place; Calgary: place; Edmonton: place; Vancouver: place; Protesters: entity