On 15 October, the ‘Welcome of the First Semester’ took place in the concert hall in Hardenbergstraße - a large, official event with a stage programme and information stands for the start of studies. The President of the UdK Berlin opened the event and welcomed the new students.
https://www.udk-berlin.de/universitaet/stabsstelle-ueberfakultaere-veranstaltungen/erstsemesterbegruessung-der-udk-berlin/

At the beginning of the semester, the faculties offer introductory events in the individual degree programmes, sometimes even introductory days. Lecturers as well as students from higher semesters inform you here about everything you need to know for a successful start to your studies, and you have the opportunity to get to know each other better.
In addition, there are introductory days at the University Library.

Every year, the Student Advisory Service compiles up-to-date information (not only) for first-year students in a brochure. You can find a digital version of this brochure here.