A man and woman talk to another woman, all looking concerned, in a room being decorated with streamers and balloons.
Some people are throwing a party.
Just because they are in a room that is decorated with streamers and balloons, does not mean that they are throwing a party.
You can't tell they are throwing a birthday party just because people look concerned in a room decorated with streamers and balloons.
People can be in the room without being the ones throwing a party.