This isn't a walkthrough guide, more like a tip for anyone confused by the lack of targets when you start this brilliant mission.
Inside the club are 11 ICA targets, disguised in various disguises. They will always have a white dot above their heads and get suspicious of you, regardless of whatever disguise you are in.
To track them, you need to follow the ones who are suspicious of you, until you see them use an earpiece to talk to their superior. They will then have the red target above their heads, and will appear on the maps.
You only need to kill 5 to end the mission.
You start with no equipment, or weapons, so must use you find!
Good luck 47!