A patient at the party coughed and did not have face coverage, health officials said, and other party guests also did not cover the face or social distancing.
"As a result, Covid-19 spread among the participating parties," the department said.
Through contact tracking, investigators were able to identify more than five confirmed coronavirus cases from the party and "many more sick individuals," according to the Health Department.
"This is an example of how good contact tracking can identify disease clusters and tell us more about the spread of disease in our community," said Dr. Matthew Feaster, an epidemiologist at the department.
"Although we continue with small modifications to Safer at Home Order, collections of people who do not live in the same household are still prohibited," said Dr. Ying-Ying Goh, director and health officer at the department. "The virus is still very contagious. Social distancing, frequent hand washing and the use of facial coatings are still our best defense against the further spread of Covid-19 in our community."