In Skiemonys, Lithuania, on Friday, June 13, 1962, at about 11 pm, and again at the same time the next day, at a place called Janoniai, 18-year-old Ramute Matiukaite allegedly saw the "Virgin dressed in white" who said to her:
"I will save mankind if people turn to God and convert... I will obtain a miracle from God, but people must pray. Sacrifices must be made, and above all the precepts of fasting and the commandments of the Church must be observed."
On June 14, the Virgin returned and said to Ramute: "We must pray. The people must make sacrifices, and especially to observe the precepts of fasting and the commandments of the Church… When you share my message with my followers, ask them first to pray with you. If people persecute you, come back here to pray and I will protect you; you will find nowhere greater happiness than the one you have just felt here."
A local pilgrimage was born. On July 25, 1962, a "luminous phenomenon" was reportedly observed at the site of the apparitions. The following month, an investigation began, which is still ongoing. Worship at the site is however encouraged by the bishop of Panevezys, the capital of Upper Lithuania.
Source: Fr René Laurentin and Patrick Sbalchiero, Dictionnaire encyclopédique des apparitions de la Vierge. Inventaire des origines à nos jours. Méthodologie, prosopopée, approche interdisciplinaire, Fayard, Paris 2007 (translated)