Primarch Victus has called for a war summit, and has taken the unusual step of including the krogan. Rendezvous with the salarian ship and use the Normandy as neutral ground for the summit.
When the mission 'starts', in the room with the female krogan
Near where you first encounter Cerberus troops
Immediately after running into a wild Yhog
After activating the first quarantine checkpoint and being ambushed
Near your first encounter with the Guardian riot shield troops
Near the power relay