And what is Corpus Christi about?
According to Wikipedia: The Feast of Corpus Christi (Latin for Body of Christ), also known as Corpus Domini, is a Latin Rite liturgical solemnity celebrating the tradition and belief in the body and blood of Jesus Christ and his Real Presence in the Eucharist. It emphasizes the joy of the institution of the Eucharist, which was observed on Holy Thursday in the somber atmosphere of the nearness of Good Friday.
In the present Roman Missal, the feast is designated the solemnity of The Most Holy Body and Blood of Christ. It is also celebrated in some Anglican, Lutheran, and Old Catholic Churches that hold similar beliefs regarding the Real Presence.
The feast is liturgically celebrated on the Thursday after Trinity Sunday or, “where the Solemnity of the Most Holy Body and Blood of Christ is not a Holy Day of Obligation, it is assigned to the Sunday after the Most Holy Trinity as its proper day”. At the end of Holy Mass, there is often a procession of the Blessed Sacrament, generally displayed in a monstrance. The procession is followed by Benediction of the Blessed Sacrament.
A notable Eucharistic procession is that presided over by the Pope each year in Rome, where it begins at the Archbasilica of St. John Lateran and makes its way to the Basilica of Saint Mary Major, where it concludes with Benediction of the Blessed Sacrament.
Corpus Christi is a public holiday in some countries with a predominantly Catholic population including, amongst others, Austria, Brazil, Bolivia, Bosnia and Herzegovina, Colombia, Croatia, Dominican Republic, Haiti, East Timor, parts of Germany, Liechtenstein, Panama, Peru, Poland, San Marino, parts of Spain and Switzerland, Grenada, Saint Lucia and Trinidad and Tobago.
Corpus Christi is primarily celebrated by the Catholic Church, but it is also included in the calendar of a few Anglican churches.