How well do the magi know each other?
There are maybe 120 magi (my guess, the number is somewhere, but the exact number is not important) magi in the Rhine tribunal - so there are maybe 10-20 young journeypeople (political corectness sucks ) among them.
Artourus is from Stonehenge - he's like the infamous boy from the other form at your school (sorry, my teacher's perspective is shining through ), or the new kid in town trying to find new friends?
Rabanus and Hildegard from Durenmar - they must know each other well, since their apprenticeships were parallel. Did they hate, like, bully each other? Play pranks on the covenfolk together? Go to Latin class together?
Honorus is from Fengheld, and a Tremere to boot - you know him (and whose filius he is), but you may not be sure if he's not playing for the other team
these are just some thoughts - not even suggestions - the player characters probably won't need to introduce themselves to the others, but they may not yet be best buddies, but our field trip might help, which is one of the reasons why I sent them on this straightforward little adventure together. What I want to avoid is that we focus on establishing a pecking order early on artificially- it might slow the story down before it begins and relationsship pattern will emerge anyway.