Archbishop Costelloe led the first speech for the Formation Day for the Archdiocesan Assembly, drawing upon the experience of the Fifth Plenary Council of Australia, and his role as President, in speaking about What is a Diocesan Assembly and the recommendations of a Diocesan Pastoral Council.

The 2023-2024 Perth Archdiocesan Assembly, continued Fr Vincent, is the first of its kind for the Archdiocese and was announced Archbishop Timothy Costelloe SDB in April 2023, and launched on Trinity Sunday 4 June 2023 at St Mary’s Cathedral.

Formally launching the 2023-2024 Diocesan Assembly on behalf of Archbishop Timothy Costelloe SDB, Episcopal Vicar for Education and Faith Formation the Very Rev Fr Vincent Glynn explained that convocation of the Assembly comes out of the recent Plenary Council held by the Church of Australia in 2021 and 2022.