The final venue was selected via a draw, carried out by the organising committee.
The British & Irish Cup final will take place on Friday, May 23. The kick-off time will be determined between the finalists and the organising committee.
Leinster 'A' are the defending British & Irish Cup champions having lifted the trophy after an extra-time triumph in Newcastle last May.
This season Girvan Dempsey's charges topped their pool with six wins from six and out-half Cathal Marsh recently inspired them to a 47-15 quarter-final victory over Munster 'A' at Donnybrook.
They are away to Welsh club Pontypridd in the last-four, with that game taking place at Sardis Road on Saturday week (April 26) (kick-off 2.30pm).
The other semi-final is between English Championship sides Bristol and Leeds Carnegie at the Memorial Stadium on Sunday, May 4 (kick-off 3pm).