Q: Recently I celebrated a Rite of Acceptance during a Sunday Mass on the First Sunday of Advent at a neighboring parish. After the signing of the senses and before the invitation to celebrate the liturgy of the Word does the concluding prayer of the Rite of Acceptance serve as the Collect for the Mass?
A: The missal has no mass for the rite of acceptance. It thinks it’s happening at a word service. The RCIA permits it to happen at mass, but gives no particulars. So, I think yes, especially if it’s Ordinary Time, that the prayer in the rite of acceptance replaces the collect. If it’s NOT Ordinary Time, best practice is probably to use the collect of the day. But I cannot point you to any documentation.