The trials will take place over three days.
Dublin City Council is going to close College Green to traffic for a series of weekend trial runs this summer.
It follows An Bord Pleanála's refusal of a proposal to turn the area into a pedestrian plaza last year.
Family events will be held over three Sundays in July and August. Dublin Bus services will be diverted, but the Luas will run as normal.
Richard Guiney is chief executive of Dublin Town, a business group which is backing the plans.
They want to see if the plaza plan is still viable,
"Basically over the course of the summer, the council is going to be running events, particularly with a family theme, on a Sunday afternoon.
So it'll give a chance to see how the plaza will operate in reality. Our view is that we should trial things to see how it works. If there's problems, we can either address them or realise that the plan won't work.
But if it does work...we can press on ahead."
He says they're hoping the trials will address concerns about how public transport would be affected,
"If it works for Dublin Bus, then I think we're a major step forward in terms of bringing the whole plan together.
The public want a plaza, but there are practical concerns about bus movements and taxi movements, and how we keep access to the city's hotels and car parks."