Christmas wafer (Polish: "opłatek" , plural "opłatki" ; Lithuanian: "kalėdaitis" , plural "kalėdaičiai" ) is a central European Christian Christmas tradition celebrated in Poland, Lithuania and in some parts of Slovakia during Wigilia, or the Christmas Eve Vigil.
Carols by Candlelight is an annual Australian Christmas tradition that originated in southeastern Australia in the 19th century and was popularised in Melbourne in 1938.
 The tradition has since spread around the world.
 It involves people gathering, usually outdoors in a park, to sing carols by candlelight, featuring live performances by both national and international celebrities and accompanied by a band and or orchestra.
 Today, the largest such event is held annually at the Sidney Myer Music Bowl in Melbourne's King's Domain Gardens on Christmas Eve since 1938.
The Pão-por-Deus (] , "bread for God's sake") celebration is a Portuguese tradition celebrated all over Portugal by children up to the age of 10 or older on 1 November, the same day of "Dia de Todos-os-Santos" (All Saints' Day).
 It is the soulmass-cakes given to the poor on All Saints Day.
 The name of this custom may vary through the many regions of the country.
 For instance, in and around Leiria it is known as "Dia do Bolinho" ("The day [to ask] for cake").
A Christmas market, also known as Christkindlmarkt, Marché de Noël, Christkindlesmarkt, Christkindlmarket, Christkindlimarkt, and Weihnachtsmarkt, is a street market associated with the celebration of Christmas during the four weeks of Advent.
 These markets originated in Germany, but are now being held in many other countries.
 The history of Christmas markets goes back to the Late Middle Ages in the German-speaking part of Europe, and in many parts of the former Holy Roman Empire that includes many eastern regions of France.
 The Christmas markets of Bautzen were first held in 1384.
 Dresden's Striezelmarkt was first held in 1434.
 Frankfurt was first mentioned in 1393, Munich in 1310 and Augsburg in 1498.
 In Austria, Vienna's "December market" can be considered a forerunner of Christmas markets and dates back to 1298.
Abhidhamma Day (Burmese: အဘိဓမ္မာနေ့ ) is a Theravada Buddhist tradition celebrated primarily in Myanmar.
 Abhidhamma Day celebrates Gautama Buddha's ascension into "tushita" heaven to teach his mother the "Abhidhamma".
 It is celebrated on the full moon of the seventh month of the Burmese lunar year which starts in April.
 The seventh month corresponds to October.
 The 2017 date for this event is October 5.
The Tió de Nadal (] , ] ; meaning in English "Christmas Log"), also known simply as Tió ("Trunk" or "Log", a big piece of cut wood) or Tronca ("Log"), is a character in Catalan mythology relating to a Christmas tradition widespread in Catalonia and some regions of Aragon.
 A similar tradition exists in other places, such as the Cachafuòc or Soc de Nadal in Occitania.
 In Aragon it is also called Tizón de Nadal or Toza.
The Amordadegan festival, also transliterated as Amordadegan or Amardadegan, is an ancient Iranian tradition celebrated 127 days after Nowruz.
 Amordadegan in Persian means "without death" the 5th month of Persian calendar is Mordad that came from Amordad or Ameretat word.
 The Amordadegan festival was celebrated by the Zoroastrians over 4000 years.
Christkindelsmärik is a Christmas market (French: "Marché de Noël") held annually in Strasbourg, France, near Strasbourg Cathedral.
 It draws in approximately 2 million visitors each year and since the arrival of TGV service in Strasbourg in 2007, the number of visitors has been on the rise.
 Hotels are booked a year in advance and some receive between 15-17% of their yearly income thanks to the Christkindelsmarik's visitors.
 It is considered one of the most famous Christmas markets throughout Europe.
 It is estimated that the city benefits of a 16 million Euros profit from this 38-day-long tradition.
 It is mostly famous for its fragrance of warm wine and spices which travels throughout the cold, winter streets.
The Christmas pickle is a Christmas tradition in the United States.
 A decoration in the shape of a pickle is hidden on a Christmas tree, with the finder receiving either a reward or good fortune for the following year.
 There are a number of different origin stories attributed to the tradition, including an origination in Germany.
 This theory has since been discounted, and it is now thought to be an American tradition created in the late 19th century.
Christmas Peace (Finnish: "joulurauha" , Swedish: "julfrid" ) is a tradition based on old Scandinavian legislation created by Birger Jarl in the 13th century, extending the tradition of the Truce of God.
 Offenders who committed crimes on religious holidays like Christmas were given harsher punishments.
 Today it is a tradition to recommend that people behave in a respectful and peaceful manner at Christmas.
 The Declaration of Christmas Peace has remained in Finland where it is an essential part of the Christmas tradition.

Question: What is an annual Christmas tradition celebrated in towns across Europe: in France, Germany, and Austria? 
Answer: Christmas market