High Quality Content by WIKIPEDIA articles! In the Roman 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, adoration of the Eucharist (Blessed Sacrament), and other devotional ceremonies held over several days. There are National and International Eucharistic Congresses.