Though Miranda is not physically present during Priority: Earth, Shepard can call her ahead of the final battle to say goodbye. She can stop by to see him, and he can meet her at the Casino for a sort of date night. Miranda will contact Shepard at his apartment following the main campaign of the Citadel DLC. She’s usually talking with a Turian, asking for supplies. She’s in front of the C-Sec office, right down the stairs.
The apartment originally belonged to David Anderson, who was going to retire there with Kahlee Sanders. The Personal Apartment is a location on the Citadel, located in Tiberius Towers on the Silversun Strip. Talk to her and you should be able to invite her after that. Interact with it to trigger a scene with Kasumi. There should be a “Suspicious Device” or something like that beside one of the tables on the main floor. You can meet Kasumi in the Silver Coast Casino. Everyone else, including present ME3 squadmates not yet mentioned, are optional invites. Preview of the festivities ahead The bare minimum of people whose survival from the first two games are assured are auto- invited: Joker, EDI, Liara, James Vega, Steve Cortez, and Samantha Traynor. Who can you invite to the party Citadel DLC? just leave the apartment and come back, and each time you’ll get more messages from the squad mates, after which you can invite them up, or go meet them at the Strip. It’s always randomized who you can invite first. You’ll need to receive Tali’s “Housewarming” email before you can invite her up.