August 21 -- Our Lady of Knock
There's a good history of the apparitions here. Alas, the article is 18 years old and the author's view of contemporary Irish Catholicism is no longer quite so accurate.
Here's what we said about Knock in years past: 2011 and 2015. I tested a couple of the links therein and, mirabile dictu, they still worked.
Labels: Ecclesia Hiberniæ