Choose what matters most
Decide whether you are traveling for a particular celebration or for an ordinary shrine visit. The principal dates: St. Francis, October 4, and the Porziuncola Indulgence, August 2, in Assisi; Our Lady of Lourdes, February 11; Fátima's anniversary pilgrimages, May 12–13 and October 12–13; St. James, July 25, with the next Holy Year in 2027; the Assumption, August 15, and Our Lady of Częstochowa, August 26, at Jasna Góra; Medjugorje's anniversary on June 25 and the Youth Festival in early August; Our Lady of Guadalupe, December 12. If an event is essential, verify the official calendar before fixing flights. Do not assume a recurring event operates identically each year; the Papal Audience, for example, is not held when the Pope is away in parts of July.
Consider the complete day
Heat, rain, daylight, and evening temperatures affect walking, queues, and outdoor prayer. Galicia is rainy in every month and busiest in July–August; Mexico City's rainy season runs June–September; Medjugorje's rocky hills are hardest in summer heat; the Lourdes torchlight procession at 9:00 p.m. is an outdoor hour at any temperature. Packing helps, but cannot make every itinerary suitable in every season. Ask how the organizer adapts the day when conditions are uncomfortable.
Balance crowds and access
Large celebrations can change entry routes, seating, transport, and hotel availability: Fátima's anniversary nights draw several hundred thousand people, and Guadalupe receives several million on December 11–12. A smaller crowd does not necessarily mean every service is offered; outside the April–October season at Lourdes the Grotto stays open but processions and many services are reduced, and the Vatican Museums close on Sundays except the last of the month. Feast-date departures also sell out earliest, commonly 9–12 months ahead for parish groups. Compare the current program and practical arrangements with the experience you hope to have.