Q: I have a gentleman in the parish who is previously baptized as a protestant and is ready to become Catholic. He has a great connection to Christmas and was wondering if he could join the Church at Midnight Mass. I looked through the RCIA book (still waiting for OCIA) and could not find anything definitive. Is this allowed?
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A: Yes, it’s allowed. A little unusual, given that Christmas is Christmas for everyone else coming that day. But if as the pastor you judge that it’s a good day, you may do it.
You introduce no changes to the Mass texts: They remain those of Christmas. But you may use the Order of Reception beginning at no. 487. There you’ll see that it is permitted on a Solemnity, as long as the Mass of that Day is used.