of the dancing egg. There is evidence this tradition dates from the 16th century. The Patum de Berga is a popular and traditional festival that is celebrated each year in the Catalan city of Berga (Barcelona) during Corpus Christi. It consists of a series of "dances" (balls) by townspeople dressed as mystical and symbolical figures. The balls are marked by their solemnity and their ample use of fire and pyrotechnics. It was declared a Traditional Festival of National Interest by the Generalitat de Catalunya in 1983, and as a Masterpiece of the Oral and Intangible Heritage of Humanity by UNESCO in 2005. Date Corpus Christi is a moveable feast, celebrated on the Thursday after Trinity Sunday, 60 days after Easter, or, in countries where it is not a holy day of obligation, on the following Sunday. The earliest possible Thursday celebration falls on 21 May (as in 1818 and 2285), the latest on 24 June (as in 1943 and 2038). The Sunday celebration of the feast, introduced in the second half of the 20th century, occurs three days later, between 24 May at earliest (for the first time in 2285) and 27 June at latest (for the first time in 2038). For Western Rite Orthodox Christians, since they use the Julian Calendar, at least for all Feast Days dependent on the date of Pascha, their date of the celebration of Corpus Christi, translates to, in the Gregorian Calendar, from 3 June at the earliest, to 7 July, at the latest. Corpus Christi is a public holiday in some countries with a predominantly Catholic population including, among others, Argentina, Austria, Bolivia, parts of Bosnia and Herzegovina, Brazil, Colombia, Croatia, Dominican Republic, East Timor, Equatorial Guinea, parts of Germany, Grenada, Haiti, Jerusalem in Israel, Liechtenstein, Monaco, Paraguay, Peru, Poland, Portugal, parts of Puerto Rico, Saint Lucia, San Marino, Spain, parts of Switzerland, Trinidad and Tobago, parts of the United States, and Venezuela. See also Adoro te devote Dancing devils of Corpus Christi Feast of the Most Pure Heart of Mary Feast of the Sacred Heart Lauda Sion List of festivals in Costa Rica Pange Lingua Gloriosi Corporis Mysterium Sacris solemniis Spello's Infiorate Transubstantiation Verbum Supernum Prodiens References External links Corpus Christi, with order for procession at www.therealpresence.org Feast of Corpus Christi: History Carthusians and Corpus Christi Corpus Christi background, from www.haverford.edu Traditional Corpus Christi celebrations in Panama Thomas M Landy, "Feasts, Processions