Instructions can be found in the CIE in the display area along the right wall as you enter. While it is O.K. to have an expired visa, it is not O.K. to let your passport expire. As an international person in a foreign country, you are expected to have a valid passport at all times. Contact your consulate to determine what specific procedure you should follow to renew. Until the passport in renewed, or valid, you will not be able to register for classes.
Most consulates request such a letter before re-issuing documents.
Allow a week during the semester and two weeks or more at the heavy travel times such as summer or winter break. If you abide by the laws of the country, it is no more risky than travel to any other country. Additionally, Mexican authorities are becoming more strict concerning misbehavior in public due to excessive consumption of alcohol and inappropriate behavior due to use of alcohol. Make and appointment with the Immigration Specialist. Attend on of the Practical Training Workshops presented by the Immigration Specialist.