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The Eucharistic Congress is a mass meeting of Catholics organized on an international basis and aimed at celebrating the mystery of the Eucharist through lectures, seminars, discussions, and the adoration of the Blessed Sacrament. The first International Eucharistic Congress owed its inspiration to Bishop Gaston de Ségur, and was held at Lille, France, on June 21, 1881. Today, the congress is typically held every four years. 
Dublin, Ireland was the site of the 50th International Eucharistic Congress held 10 -17 June 2012. The Congress theme was "The Eucharist Communion with Christ and with one Another." Dublin also served as the site of the 31st Congress in 1932. The Vatican issued two stamps in commemoration of the 50th Congress. The €0,75 stamp is the Celtic Cross from the Rock of Cashel in Tipperary. The €1,00 stamp depicts the Armagh Chalice, metal work from West Limerick (1868). The stamps were issued in sheets of 10. Philatelic commemoration of prior International Eucharistic Congresses was the subject of an article in the Second Quarter 2012 edition of the Vatican Notes. Check out the article in the remarks section below. 
Reference: <a href='https://www.vaticanstamps.org/vaticannotes/idisplay.php?p=60-352-24-25&r=0'>International Eucharistic Congress Philately</a>

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