IKUE organizes
Masses during Esperanto meetings, and also each year its own week-long international convention. Associations and local groups of Catholic Esperantists also offer meetings (
Bible weekends, youth camps, etc.) IKUE publishes Christian literature in Esperanto, e.g. the
ecumenical prayer and
hymnbook ADORU of 1,472 pages in 2001 (co-edited with the
Protestant Esperantist association), and the
encyclical Deus caritas est in 2006. Its magazine
Espero Katolika (
Catholic Hope) first appeared in 1903. In 2015, the union had approximately 1,530 members in 40 countries (mainly Europe). ==Recognition from the Vatican==