Your Coli studies come to a close after 6 to 16 semesters and You still could not get enough? Sign up for the alumni mailing list to get comfortably notified about upcoming events like the Sommerfest and the Jahresabschlussfeier. Just like that You get to reminisce and question your life goals:

http://lists.cl.uni-heidelberg.de:8080/mailman/listinfo/alumni

Remember that your institute email address will get deleted (probably), so preferably register with a different email.