Most healing masses that I have attended are specifically advertised in parish bulletins whenever the pastor or a visiting priest is willing to administer the Sacrament of Extreme Unction within the context of a mass. And no, it has nothing to do with the charismatic renewal, nor did it originate there.
Perhaps the last poster heard about prayers for healing being done within a charismatic prayer meeting, or within a liturgy celebrated by charismatics. But the RCC has offered the mass for the sick as explained above, for many years now. It is usually done only a couple times a year. My diocesan newspaper will often advertise this so that neighboring parishioners may travel to the local church offering this liturgy, since it is not offered that frequently.
That was an erroneous statement from the last poster to say “we have gotten over it.”
It is very appropriate to celebrate this liturgy, for there is always a need to administer the sacrament to the sick. The readings, hymns, and homily are all geared toward encouraging and strengthening those who are sick.