Áontú leader Peadar Toíbín organised the gathering to pressure Independents on the fence.
Four presidential hopefuls, including Maria Steen, will present their cases to 11 undecided TDs and senators today.
After the pitches, the group will hold a vote using proportional representation.
Áontú leader Peadar Toíbín, who organised the event, hopes it will build momentum and pressure fence-sitting Independents.
To make the ballot, a candidate must secure 20 Oireachtas nominations or backing from four councils.
The Meath West TD says they need to discuss the current values of this country:
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