Heatwave: Knockout come to visit you.
Chase: Smokescrean went there to visit, but Chase had to arrest him for speeding.
Blades: Bee and blades are best buddies so it was easy to get him.
Blurr: Weeljack wheeljack met him the same day as you.
Bumblebee: Bee has had several chances to encounter shockwave and soundwave in battle.
optimus prime: same as bee.
quickshadow: She only met unicron because you make him angry, but this time he decided to chase you.
sideswipe: It was when you asked optima to let your father visit you and he allowed it.
High Tide: Ultra magnus wanted to know how you and the team are doing.
Ratchet: Also like bee and optimus.