For students graduating HSE there is an online service which allows to request post-diploma holidays. Read a detailed instruction on how to use it by this link.
If you are willing to stay in Russia for some extra time after the end of your course, you can use the service to request post-diploma holidays, and then, in advance, apply for the extension of your:
- visa (if applicable);
- registration,
based on the certificate of attendance with the extended course time including the post-diploma holidays. You can order the certificate at Student Service Center. - please indicate in the comment field of the order form, that you need the certificate with end of course including post-diploma holidays.