Gardaí attended St Stephen's Green after barriers pulled down around bandstand
Videos at the scene shows people dancing, singing and climbing on the structure.
Gardaí attended St Stephen's Green on Thursday evening after a large group of people gained entry to a bandstand which had barriers placed around it to protect the structure.
Footage at the scene shows a large number of people dancing and playing music in the bandstand.
Gardaí said it was alleged that a number of persons had removed the fencing to a protected structure in the area but said the crowd dispersed when Gardaí arrived on the scene.
No arrests were made and investigations into the incident are ongoing.
Separately, the Office of Public Works (OPW) made the decision to close Saint Stephen's Green Park.
In a statement, An Garda Síochána said: "Where crowds gather, An Garda Síochána's responsibility is preserving public order and preventing and investigating any criminal offence which occurs.
"An Garda Síochána continues to appeal to the public to avoid crowded areas and large gatherings; take personal responsibility to protect yourself and others, wear face coverings in open spaces, and maintain social distancing.
"The wearing of face masks outdoors and social distancing are public health guidelines and are not penal regulations."
It comes as it was announced extra bins and toilets are being brought into the city to facilitate the "outdoor summer".
Dublin City Council confirmed 150 portaloo toilets, 54 large eurobins and 80 barrel bins will be placed across the city centre, with a specific focus on high footfall areas.
Main image via Jack Power on Twitter