The public services of the Jobcenter are closed. You can try and make an appointment on the phone.

Contact:
Email: Jobcenter-LK-Tuebingen@jobcenter-ge.de
Phone: 07071 / 56520

If you have any papers to hand in, you should do this by email rather than personally.

You will not get any problems if you hand in documents late, during this time.

The Agentur für Arbeit is closed, too.

Contact:
http://www.arbeitsagentur.de/eServices
Phone: 0800 4 555500 (gebührenfrei)

If you lose your job (i.e. if you get fired), you have to report that you are unemployed. You can do this in written form and put the letter into the postbox of Agentur für Arbeit.