Question: Lei Day celebrates an object that is a type of what?

Context paragraphs:
Finnish Swedish Heritage Day: Finnish Swedish Heritage Day (Swedish: "Svenska dagen", Finnish: "Ruotsalaisuuden päivä") is a general flag day, which is celebrated in Finland on November 6.  The day celebrates the Swedish-speaking population of Finland, their culture, and the bilinguality of Finland.  The main celebrations are aired on the radio, and many smaller celebrations are held around Finland in schools.  Usually, the song Modersmålets sång is sung, celebrating the mother tongue.  The Finnish Swedish Heritage Day is celebrated on the same day as Gustavus Adolphus Day in Sweden, the day that king Gustavus Adolphus of Sweden was killed at the Battle of Lützen in 1632.

Birth of Bahá'u'lláh: The Birth of Bahá'u'lláh is one of nine holy days in the Bahá'í calendar that is celebrated by Bahá'ís and during which work is suspended.  The holy day celebrates the birth of Bahá'u'lláh, the founder of the Bahá'í Faith.  The 2016 date is November 2.

Abhidhamma Day: 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.

World Metrology Day: World Metrology Day celebrates the signature by representatives of seventeen nations of the Metre Convention on 20 May 1875.  The Convention set the framework for global collaboration in the science of measurement and in its industrial, commercial and societal application.  The original aim of the Metre Convention – the worldwide uniformity of measurement – remains as important today as it was in 1875.

Beatles Day: Beatles Day celebrates The Beatles' triumphant return to Liverpool on 10 July 1964 from their US tour, just in time for the premiere of their film "A Hard Day's Night".  This day is considered one of the landmarks in their rise to fame, and, since 2008, its anniversary has been celebrated as Beatles Day in both Liverpool and Hamburg, the cities where the Fab Four laid the foundations for their stardom.  Others choose to celebrate "Beatles Day" on 27 February in the USA to mark the beauty and peacefulness of the Fab Four's music in time for Spring.

Stephen Foster Memorial Day: Stephen Foster Memorial Day is a United States Federal Observance Day observed on January 13.  According to 36 U.S.C. § 140, Stephen Foster Memorial Day celebrates the life of American songwriter Stephen Foster.  The date commemorates date that Foster died.  The law took effect on November 2, 1966, and the day was first observed in January 1967.

West Virginia Day: West Virginia Day is a state holiday celebrated every June 20 in the American state of West Virginia.   The day celebrates the anniversary of the creation of the state as a result of the secession of several northwestern counties of Virginia during the American Civil War.

Lei Day: Lei Day is a statewide celebration in all of Hawaii.  The celebration begins in the morning of May first every year and continues throughout the entire day and even continues onto the next day.  Lei day was established as a holiday in the year of 1929 and continues to this day.  Each Hawaiian island has a different type of lei that is used for the celebration and for its people to wear.  The festivities have consistently grown each year and the state of Hawaii has had to move the location of the event.  Lei day was first held in the Courts and Town Halls but has since been moved to Kapi'olani park where it is still being held today.

Lei (garland): Lei (/leɪ/ ) is a garland or wreath.  More loosely defined, a lei is any series of objects strung together with the intent to be worn.  The most popular concept of a "lei" in Hawaiian culture is a wreath of flowers presented upon arriving or leaving as a symbol of affection.  This concept was popularized through tourism between the Hawaiian Islands and the continental United States in the 19th and 20th centuries.

Queene's Day: Queene's Day celebrates the accession of Queen Elizabeth I to the throne of England on November 17, 1558.  Observance of the accession was a national holiday in England and Wales for about 300 years, often with the building of enormous bonfires.  It was revived in the village of Berry Pomeroy in Devon in 2005.

Supporting paragraphs: Lei Day Lei (garland)
Answer: garland or wreath