Where did they come from? I ask this because we now know that they are not a Rite of the Catholic Church.
Both "Redemptionis Sacramentum" and "Sacramentum Caritatis" speak very clearly about Celebrations in the abscence of a priest. Such Celebrations are extraordianary events to enable Catholics to pray together on Sundays when there is no priest. There is no intimation that these Celebrations can also be held on weekdays. The distribution of Holy Communion at such a Sunday Celebration requires the Bishop's permission. (Redemptionis Sacramentum, 162ff) Nor can lay people preside at any Liturgy. Only a priest can preside (even at a Liturgy of the Word).
Well, even though the era of experimentation is now over we will probably still find enclaves up and down the country where lay people open the taberbernacle, stand at the altar, give themselves Holy Communion before distributing the Sacred Species to others. These rogue services are more akin to Protestant Communion Services where there is neither Priest nor Sacrifice. The so called "Eucharistic Service" beguiled many for a time and has distracted us from "a genuine hunger for the Eucharist".
In my last parish I had to intervene on a number of occasions to correct a woman who was giving Benediction with the Monstrance to a group of other women!