Police in South Belfast have issued 55 coveted notices and three restraining notices in the Holland area.
The parties in which the party was being held were inspected by officials on Thursday night and early Friday morning.
In an apartment, officers discovered more than 30 people, three of whom tried to hide by locking themselves in a bathroom.
Issued notices to most of whom had home addresses throughout the NI.
CH Inspector Gavin Kirkpatrick said it was “disappointing and frustrating that some people continue to disregard clear and specific advice, direction and caution.”
Police patrols in Holland have been stepped up as students return before the university resumes next week.
CH Inspector Kirkpatrick said police would dedicate “substantial resources” to police in the area and work alongside councils and universities to address ongoing problems.
There have already been several arrests and complaints from residents about anti-social behavior.
Political parties have called for greater intervention in Hollywood to house student groups and prevent the spread of infection.
CH Inspector Kirkpatrick said that while a large number of people were behaving responsibly, the police would “deal with all incidents of criminal activity with vigor”.
He added: “I would like to warn young people who have moved to Holland and who are visiting the area that you and others are responsible for complying with healthcare regulations to protect you from Covid-19.
“Young people who gather or travel in this area should really consider their work for their own health and the people of the community in this residential area.”
Universities issue warnings
Both Ulster University (EUU) and Queens University will face an automatic suspension for students violating the Covid-19 guidelines.
Professor Ian Grayer, Queen’s president, added that those who break the rules risk “substantial fines”.
A statement from the EU said that students face sanctions, including “expulsion and illegal immigration”.
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