2249
at a white house gathering of aids activists and lawmakers from around the world , the president said hir plan could prevent 7 million new hiv infections -- and treat at least 2 million people over the next decade .
 white house: place; activists: entity; lawmakers: entity; president: 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: meet 
  Option: entity, place 
Text: {0} 
Answer:
 white house: place; activists: entity; lawmakers: entity; president: entity