When they occur would be appreciated as well.
there are 3 interviews.
-The first interview takes place if Shepard speaks to Diana after Priority:Tuchanka has been completed and the genophage cure either real or fake has been dispersed.
-The second interview is after Shepard defends the Citadel from a Cerberus attack(you will get e-mail).
-The third interview takes place after Priority: Rannoch has been completed.