The MVV-Semesterticket consists of a solidarity fee that is mandatory for all students, which entitles them to travel within the entire MVV network at certain times of day with a student ID, and an optional season ticket, the IsarCard Semester, which entitles students to travel within the entire MVV network area at any time of day and can be purchased from ticket machines and at MVV points of sale.
By paying the solidary fee per semester every student gets a MVV-pass for the entire network valid during low-demand hours, i.e. Monday to Friday from 6 p.m. to 6 a.m. as well as 24 hrs. on Saturdays, Sundays, weekends and public holidays, (on) December 24th and 31st. Hence, you can use public transport to get to the next party or to go on trips on the weekend.