Caltra among 48 teams in sevens
Other top club sides participating include former All-Ireland club champions Castleisland Desmonds (in the same group as Caltra), Corofin and Kilmacud Crokes, along with reigning Leinster champions St Brigid's.
Last year's Sevens winners Aghada from Cork will defend their crown. Kilmacud Crokes executive committee chairman Neil O'Flaherty cited their success as an example of what their competition symbolised.