Of course, nowadays you can find everything on the Internet. But if you are not far from Mannheim you can also come and see everything with your own eyes, and ask as many questions as you want.
Information events for prospective students
Information day about the courses of study
Activities for high-school students, every year in November. Next date and programme (in German): here
A whole day especially dedicated to female prospective students. They can discover a lot about technology and maybe see engineering as their possible future.
As a part of the vocational guidance in high schools ("Berufsorientierung an Gymnasien"), numerous teachers take their classes to Hochschule Mannheim.
Information day for applicants
Every semester, after the application deadline for undergraduate studies (Bachelor), the Department of Information Technology invites all applicants to visit their prospective study place and offers presentations by experts, rounds of talks with students, and a tour through the laboratories, where current projects are shown.
More (in German).