What is Eucharistic congress?

In the Catholic Church, a eucharistic congress is a gathering of clergy, religious, and laity to bear witness to the Real Presence of Jesus in the Eucharist, which is an important Roman Catholic doctrine. Congresses bring together people from a wide area, and typically involve large open-air Masses, Eucharistic adoration , and other devotional ceremonies held over several days. Congresses may both refer to National and International Eucharistic Congresses.

Paschal Baylón is considered the patron saint of such eucharistic congresses.