This takes place in Paris
during "The Showstopper
You must find the IAGO invitation inside the washroom; it belongs to Tobias Reaper. Once you have the invitation, proceed through the security checkpoint to the meeting, and show you badge at the entrance and the first floor security. At the second floor security, you will get frisked, so don't have a gun on you. Once on the third floor, find the meeting room and sit down in the chair. Wait for about 2 minutes and this will unlock.