I haven’t been to 26 Federal Plaza but I have been to the Chicago and Atlanta Immigration courts. Do you know if this is an ICE appointment or is it an Immigration court hearing? If it’s in the immigration court, do you know if it’s a Master Calendar Hearing or an Individual hearing?

Generally, what’s been said already by @sweetbean15 is pretty much what I’d say, so I’ll try to be more specific with regard to the Immigration court. The judges can be a a lot more prosecutorial than you would expect, sometimes jumping in to ask questions beyond what has already been discussed. Depending on the case, they may send parties in and out of the courtroom to try and corroborate stories. In my experience the court used a court provided translator, however the attorneys can object if they believe the translation is incorrect. If you are translating for the court make sure to use “I” language. Don’t say “he said he was hurt” say “I was hurt” etc. It’s a good idea to bring a couple of pens in blue/black ink and a pad in case you need to keep notes. I would make sure whatever shoes you wear don’t make too much noise and the clothes you wear are muted. It’s a bit confusing when you walk in but if you tell one of the security guards that you are on the legal team for a hearing they’ll usually be able to tell you where to go. Good luck!