I haven’t read on Garabandel as I stick to the approved appartions. Those that I’m most familiar with are Fatima, Akita and Lourdes. As a former Protestant to whom Marian apparitions were not exactly part of my mother’s milk, it was a bit of a surprise to hear my old Protesant Pastor comment on Marian apparitions that “There’s been a lof of them” and “I think they’re a judgment on a divided church”. He thought God was sending Mary as a warning. But it takes the eyes of faith to accept it.
Personally I also think that God has been sending Mary as a warning. If you read the opening verses of chapter 12 of Revelation, it speaks of a portent in the heavens eg. a woman with the sun, twelve stars etc. The apparition at Fatima for example involved “the miracle of the sun” if you bother to read up on it (with about 70,000 witnesses to boot). From what I gather round and about, some eerie things happened involving the sun at Medjugorge also, but it hasn’t been approved.
At Zeitoun in Egypt (only 40 years ago, and lasting 3 years on and off), which is a Coptic approved apparition, there were over a million witnesses.
Akita, which has the toughest warnings and just after Zeitoun (eg. “You have no idea what is being prepared for you if you do not change”), the statue wept 101 times, and they were real human tears.
But because the church is divided and Protestants in particular take little notice, the warnings are being given and much of Christendom is ignoring them. We’re being warned, and at the same time we’re being judged for our continued disobedience in dividing the church.