Question: Gelvonai is a town in a county whose administration was abolished on what date?

Context paragraphs:
Utena County: Utena County (Lithuanian: "Utenos Apskritis" ) is one of ten counties in Lithuania.  It is the country's most sparsely populated county.  The capital and the largest city in the county is Utena, which is 95 km from Vilnius, the capital of Lithuania.  On 1 July 2010, the county administration was abolished.  Since that date, Utena County remains as the territorial and statistical unit.

Alytus County: Alytus County (Lithuanian: "Alytaus apskritis" ) is one of ten counties in Lithuania.  It is the southernmost county, and its capital is the city of Alytus.  Its territory lies within the ethnographic region of Dzūkija.  On 1 July 2010, the county administration was abolished, and since that date, Alytus County remains as the territorial and statistical unit.

Welsh Tract: The Welsh Tract, also called the Welsh Barony, was a portion of the U.S. state of Pennsylvania settled largely by Welsh-speaking Quakers.  It is located to the west of Philadelphia.  The original settlers, led by John Roberts, negotiated with William Penn in 1684 to constitute the Tract as a separate county whose local government would use the Welsh language.  The Barony was never formally created, but the many Welsh settlers gave their communities Welsh names that survive today.  A more successful attempt at setting up a Gwladfa (Welsh-speaking colony) occurred two centuries later, in the Chubut Province of Patagonia, Argentina.

Vilnius County: Vilnius County (Lithuanian: "Vilniaus apskritis" ) is the largest of the 10 counties of Lithuania, located in the east of the country around the city Vilnius.  On 1 July 2010, the county administration was abolished, and since that date, Vilnius County remains as the territorial and statistical unit.

Klaipėda County: Klaipėda County (Lithuanian: "Klaipėdos apskritis" ) is one of ten counties in Lithuania.  It lies in the west of the country and is the only county to have a coastline.  Its capital is Klaipėda.  On 1 July 2010, the county administration was abolished, and since that date, Klaipėda County remains as the territorial and statistical unit.

Floreana Island: Floreana Island is an island of the Galápagos Islands.  It was named after Juan José Flores, the first president of Ecuador, during whose administration the government of Ecuador took possession of the archipelago.  It was previously called Charles Island (after King Charles II of England), and Santa Maria after one of the caravels of Columbus.

Marijampolė County: Marijampolė County (Lithuanian: "Marijampolės apskritis" ; Polish: "Okręg mariampolski" ) is one of the ten counties in Lithuania.  It is in the south of the country in the historical Suvalkija region, and its capital is the town Marijampolė.  On 1 July 2010, the county administration was abolished, and since that date, Marijampolė County remains as the territorial and statistical unit.

Gelvonai: Gelvonai is a town in Širvintos district municipality, Vilnius County, east Lithuania.  According to the Lithuanian census of 2011, the town has a population of 284 people.  The town has a Catholic church.

Navegantes Airport: Navegantes–Ministro Victor Konder International Airport (IATA: NVT, ICAO: SBNF) is the airport serving Navegantes, Brazil, as well as Itajaí, Camboriú, and Blumenau.  It is named after the Itajaí-born Victor Konder (1886-1941), Minister of Public Works (1926-1930), whose administration encouraged the birth of Brazilian commercial aviation.

List of mayors of Washington, D.C.: The list of mayors of Washington, D.C. is a reflection of the changing structure of its local government.  Washington, D.C. was formed with the passage of the amended residency Act of 1791 and the government at the time defined in the 1790 Residency Act.  From 1791 to 1802 the District was managed by a three-member board of Commissioners.  With the passage of the 1802 Organic Act, the District was divided into two counties, Alexandria County west of the Potomac and Washington County to the east.  The counties were governed by levy courts made of providentially appointed Justices of the Peace, but the District's three cities, Georgetown, Washington City and Alexandria each had their own municipal government.  Prior to 1812, the levy courts had a number of members defined by the President, but after that Washington County had 7 members.  In 1846, Alexandria County returned to Virginia.  In 1848, the Washington County levy court was expanded to 11 members and in 1863 it was reduced by two to nine members.  With the District of Columbia Organic Act of 1871, the three municipalities within the District of Columbia were abolished in favor of a single District government, whose chief executive was a territorial Governor.  This office was abolished in 1874, and replaced with a temporary three-member Board of Commissioners appointed by the President.  The board was made permanent in 1878 and this system continued until 1967, when it was replaced by a single mayor-commissioner and city council appointed by the President.  Finally, in 1974, the District of Columbia Home Rule Act allowed for District residents to elect their own mayor.

Supporting paragraphs: Gelvonai Vilnius County
Answer: 1 July 2010