It occurs nine weeks after Easter
Corpus Christi changes each year depending on when Easter falls. It is celebrated eight to nine weeks after Easter on the Thursday following Holy Trinity Sunday. This year it falls on May 31st.
It’s a religious celebration
Like many festivals in Spain, the origins of Corpus Christi are religious. It is celebrated by the Roman Catholics, the Church of England and some other Anglican churches. Essentially it celebrates the Eucharist and the presence of the body of Christ in holy water.