Charity is in short supply here, so I will restrict myself to saying that what is celebrated in my church is what I read from the Missals and lectionaries. We have no IC service, so there is no mention of it liturgically. It is a private pious belief on the part of a parishioner. So far as the Church is concerned, the BVM is the Theotokos and that's that.
In Christ,
Deacon Paul+
One final note, on my part, about this:
In the American Missal, one finds 'The Conception of the BVM' on Dec 8th. It calls her conception 'spotless' and says that it came about through foreknowledge of the coming birth of the Son. The conception is not there called 'immaculate', which is all I was saying before.
In Dom Gregory Dix's superb 'Shape of the Liturgy' he discusses the IC as a feast, noting it was invented by Anglo-Saxons in the 11th century (i.e., just before the Norman Conquest), and was exported to the Continent. It was not readily received there and only slowly gained acceptance, at least as a commemoration of the purity of our Lady. It was accepted into the Roman Kalendar in 1477. Its subsequent history is better known.
It is sad that this has overwhelmed the rest of the discussion, and only came up because the reporter insisted on asking us about it and then highlighting it in the article.
In Christ,
Deacon Paul+