One attendee at the pilot concert at the Royal Hospital Kilmainham returned a positive Covid-19 antigen test.
However, the attendee then took a PCR test, which ultimately came back as negative.
Over 4,000 people were tested at the concert.
The person who returned the positive antigen test was not admitted to the concert.
They then took a PCR test, which this morning returned as negative.
The Irish Government will run a series of pilot events over the coming months, to learn how the country can safely return to normal life.
Antigen tests will be a factor in these pilot events, despite some of those in the Irish medical community, most notably the CMO Dr. Tony Holohan, who are opposed to the liberal use of the rapid tests.