Until 1916 it housed German prisoners of war in an abandoned distillery and crude huts, but in the wake of the 1916 Easter Rising in Dublin, Ireland, the German prisoners were moved and it was used as a place of internment for approximately 1,800 Irish prisoners, among them such notables as Michael Collins and Arthur Griffith.
Hence, when that "meeting" was convened, it was convened by Arthur Griffith in his capacity as "Chairman of the Irish Delegation of Plenipotentiaries" (who had signed the Treaty).
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The delegates were Arthur Griffith, Robert Barton, and Michael Collins; Secretary to the delegation was Robert Erskine Childers who was also Robert Barton's cousin and father of the Fourth President of Ireland Erskine Hamilton Childers.
Along with Arthur Griffith and Denis Devereux he founded the Celtic Literary Society, and with Griffith founded the first Cumann na nGaedheal.