What is the flow of the candlelight procession in Lourdes?

Answer 1

It starts at 9pm. People walk around the route in the Domain area. People have candles. They pray the rosary and other prayers and sing hymns. They follow a statue of Our Lady that leads the procession. It is brought around the Domain area, starting from the Grotto. It then goes to the basilica at the top and then comes back down and into the Rosary Square. People follow it for part of that but they don't go up to the basilica, but gather in Rosary square to look up at the statue. Different parts of the rosary are said in different languages like French, Italian, Spanish, English, Dutch and German, as there are people from many countries there and those are the main languages that people will understand. People raise their torches during parts of the hymns. At the end people disperse and go to different places, some going back to their accommodation and others to the grotto.

Answer 2

Wikipedia, quoting from Oliver Todd's The Lourdes Pilgrim:

The Blessed Sacrament procession is held daily at 4.30pm. The procession begins at the open-air altar in the Prairie, and is usually led by a priest or bishop carrying a monstrance containing the Blessed Sacrament. Typically the bearer of the Blessed Sacrament is sheltered from the elements by a mobile awning carried by four assistants.

The exact order of the procession varies from time to time. The Blessed Sacrament may be preceded by bearers carrying leafy branches, incense burners or other devotional items. These bearers are usually lay people who may be invited specially. The Blessed Sacrament is usually followed by a group of priests who concelebrate the rite. Following these are groups of pilgrims, usually under a group banner, and in no particular order, although larger groups tend to dominate the procession near the front.

The procession makes its way across the Gave, alongside the ramps, and past the Crowned Statue, along the Esplanade to the Cross at the far end, and then around it, and down into the Underground Basilica (where participants may be seated). Pilgrims in wheelchairs are brought to the front in each case.

During the procession there are meditations, prayers, hymns and chants, in several languages. When all the participants have assembled, there follows a period of Eucharistic Adoration, and the Blessing of the Sick.[