Off Fr Z’s blog, quoting the USCCB, quoting the Annus Fidei (Year of Faith) website:
On the Solemnity of Corpus Christi, the Holy Father will preside over a special Eucharistic adoration that will extend at the same time all over the world involving the cathedrals and parishes in each diocese. For an hour, at 5 PM (Rome time), the whole world will be united in prayer and adoration of the Blessed Sacrament.
Imagine. 1.1 billion Christians, praying at the same time. Nearly 1/6 of the world’s population.
Okay … say 10% will do this. 100 million. It could still be very powerful. The world needs this to be done.

Eucharistic adoration at Saint Brigid of Kildare Church (Dublin, Ohio), via Wikimedia Commons

Crucifix with the Virgin and St John