Campbell College edged Methodist College 11-10 in Saturday's Ulster Schools' Cup quarter-finals to set up a last four meeting with Dalriada.
Ballymoney school Dalriada beat Bangor GS while RBAI and Ballymena Academy secured wins over Sullivan Upper and BRA respectively.
Inst will face Ballymena in the first semi-final at the Kingspan Stadium on Monday, 29 February.
Dalriada take on Belfast-based Campbell the following day at the same venue.
|Danske Bank Schools' Cup quarter-final results|
|Campbell College||11-10||Methodist College|
|Ballymena Academy||20-9||Belfast Royal Academy|