Question: The film Darkon follows the Darkon Wargaming Club based in Baltimore, Maryland, a group that participates in an activity with this 4-letter acronym name.

Context articles: Darkon (film)
Baltimore Orioles F.C.
Hunt Valley, Maryland
BRD Trilogy
Naomh Abán GAA
Chadstone Football Club
Dbm
Franklin Street Presbyterian Church and Parsonage
Darkon Wargaming Club
O'Donovan Rossa (Skibbereen) GAA

Darkon is an award-winning feature-length documentary film that follows the real-life adventures of the Darkon Wargaming Club in Baltimore, Maryland, a group of fantasy live-action role-playing (LARP) gamers.
 The film was directed by Andrew Neel and Luke Meyer.
Baltimore Orioles F.C. were a soccer club based in Baltimore, Maryland.
 The club was formed in 1893 and in 1895 the club folded.
 They were sponsored by the early professional baseball circuit, the National League with their 19th Century Baltimore Orioles baseball club, who were then famous for winning three League championships in a row: 1894, 1895, and 1896.
 The "Orioles" soccer/football club played in the short-lived league of the American League of Professional Football.
Hunt Valley is an unincorporated community in Baltimore County, Maryland, United States.
 Its traditional name was based on being just east of Maryland's traditional Horse Country (like the Kentucky Blue Grass region), and the site of the venerable Maryland Hunt Cup championship of steeplechase horse racing and jumping established 1894.
 It lies just north of the city of Baltimore, along the York Road (former old historic Baltimore-York Turnpike) which is now Maryland Route 45 off Interstate 83.
 The Loch Raven Reservoir nearby is an important drinking water resource and with its surrounding forested watershed is one of three reservoirs (Loch Raven, Prettyboy and Liberty) established for the City of Baltimore and its surrounding metropolitan areas in Baltimore County since the 1880s and expanded in the 1910s.
 Located at a latitude of 39.5° North and longitude 76.7° West.
The BRD Trilogy (German: "BRD-Trilogie" ) consists of three films directed by Rainer Werner Fassbinder: "The Marriage of Maria Braun" (1979), "Veronika Voss" (1982), and "Lola" (1981).
 The films are connected in a thematic rather than in a narrative sense.
 All three deal with different characters (though some actors recur in different roles) and plotlines, but each one focuses on the story of a specific woman in West Germany after World War II.
 The three letter acronym "BRD" stands for "Bundesrepublik Deutschland", the official name of West Germany and of the united contemporary Germany.
Naomh Abán GAA is a Gaelic football club based in Baile Bhuirne, County Cork, Ireland.
 It participates in games of the Muskerry division of the Cork GAA.
 The club has experienced senior grade football within Cork county for many years.
 It now participates in the Premier Intermediate grade.
The Chadstone Football Club (formerly Syndal Tally-Ho) is an Australian rules football club based in Chadstone, Victoria, Australia.
 The club participates in the Victorian Amateur Football Association D4 league.
 The club also has a team which participates in the Football Integration Development Association (FIDA) competition for players with an intellectual disability.
The dbm library was a simple database engine, originally written by Ken Thompson and released by AT&T in 1979.
 The name is a three letter acronym for "DataBase Manager", and can also refer to the family of database engines with APIs and features derived from the original "dbm".
Franklin Street Presbyterian Church and Parsonage is a historic Presbyterian church located at 100 West Franklin Street at Cathedral Street, northwest corner in Baltimore, Maryland, United States.
 The church is a rectangular Tudor Gothic building dedicated in 1847, with an addition in 1865.
 The front features two 60 foot flanking octagonal towers are also crenelated and have louvered belfry openings and stained glass Gothic-arched windows.
 The parsonage has walls of brick, heavy Tudor-Gothic window hoods, and battlements atop the roof and was built in 1857.
 This church was incorporated in 1844 by a group of men from the First Presbyterian Church then located at the northwest corner of East Fayette Street and North Street (now Guilford Avenue) in downtown (later relocated in 1854 to West Madison Street and Park Avenue in Mount Vernon-Belvedere neighborhood after selling their previous third church building of 1790-95 to the Federal Government which built a U.S. Courthouse there [to 1889, replaced again 1932] dedicated in 1860 by President James Buchanan).
 They felt the need for a new church in that fast-growing northern section of the city formerly "Howard's Woods" of Col. John Eager Howard's (Revolutionary War commander of the famed "Maryland Line" regiment of the Continental Army) country estate "Belvedere" (mansion located at intersection of North Calvert and East Chase Streets, razed 1875) where the Washington Monument was erected with its four surrounding park squares just two blocks from their new building.
 Franklin Street Church was also located on "Cathedral Hill" in the southern part of the community bordering downtown and across the street from the old Baltimore Cathedral (Basilica of the National Shrine of the Assumption of the Blessed Virgin Mary) erected 1806-1821 and designed by Benjamin Latrobe.
 Later in 1882-1886, philanthropist Enoch Pratt founded his central library for the new Enoch Pratt Free Library then facing West Mulberry Street at Cathedral, a block south which was replaced in 1931-33 by a new central library building encompassing the entire block and now directly across Franklin Street from the F.S.P.C.
 In 1973, the two historic congregations reunited to form The First and Franklin Street Presbyterian Church and was centered at the First Church site on West Madison and Park.
 The Franklin Street building was used by the merged congregation for a time and then sold to a fundamentalist independent Protestant congregation and later re-sold to the present "New Unity Church Ministries".
 Across Cathedral Street to the northeast was the 1820s era Greek Revival home designed by Robert Mills (who also did the Washington Monument two blocks away) which later was occupied by the original Maryland Club, an exclusive Southern-leaning dining and leisure society of gentlemen, founded 1857 that was once threatened by Massachusetts Militia Gen. Benjamin F. Butler, U.S.A. when he occupied Baltimore at the beginning of the Civil War on May 13, 1861, and fortified Federal Hill with a Fort and cannons overlooking the harbor and city, "to put a shot into it" if he spied a reputed rebel flag flying or any discontent to declared martial law.
 The Club later moved to North Charles and East Eager Streets in 1892 and mansion was later replaced by the former Central Building of the Young Men's Christian Association of Central Maryland (YMCA) which was closed in the 1980s and the building renovated as the Mount Vernon Hotel and Cafe.
The Darkon Wargaming Club is a non-profit battle gaming and live-action role-playing (LARP) club in the United States based in the Baltimore/Washington/Virginia area.
O'Donovan Rossa or Skibbereen is a Gaelic football and hurling club based in Skibbereen, County Cork, Ireland.
 It participates in Cork GAA competitions.
 Traditionally, the club has been much more successful in Gaelic football.
 It won its only Cork Senior Football Championship in 1992 and subsequently won the All-Ireland Senior Club Football Championship after beating Éire Óg of Carlow in the final.
 The club participates in the Carbery division of Cork GAA.