Question: Festival Imperial festival's flagship beer is manufactured by who?

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Churchkey Can Company: Churchkey Can Company is a brewery founded in 2012 by actor Adrian Grenier and former Nike designer Justin Hawkins in Seattle, USA.  The brewery's name refers to its flagship beer, which must be opened using a can piercer, or "church key".

St Austell Brewery: St Austell Brewery is a brewery founded in 1851 by Walter Hicks in St Austell, Cornwall, England.  The brewery's flagship beer is "Tribute Ale", which accounts for around 80% of sales.  Other popular ales include "Proper Job", "Tinner's Ale" and "Duchy Bitter".

Festival Imperial: Festival Imperial is a major Costa Rican music festival organized by Cerveceria Costa Rica and their flagship beer: Imperial.  The first festival took place in April 2006 and brought world-known performers such as Sting, Jamiroquai, Diego Torres, and The Rasmus.  The second edition of the festival was held on April 2008 and featured: Duran Duran, Incubus and Smashing Pumpkins among others.

De Koninck Brewery: De Koninck Brewery (Brouwerij De Koninck) is a Belgian brewery based in Antwerp ("Antwerpen" in Dutch).  The glass in which De Koninck's flagship beer is served is called a "bolleke", although this term is most colloquially used to refer to a glass filled with the beer itself and is the way the beer is ordered in bars.

Surname-i Hümayun: The Surname-i Hümayun (Imperial Festival Books) were albums that commemorated celebrations in the Ottoman Empire in pictorial and textual detail.  Such celebrations included mainly imperial weddings and circumcision festivals.  These albums were commissioned by the Ottoman Imperial family, usually by the Sultan presiding at the time.  The Surname recounts the festivities in order of when the events took place, which includes in detail processions, grand entrance of the Sultan, feasts, entertainers, musicians, dancers, gift giving, firework displays, circumcision and wedding ceremonies.  Although many of the Surnames were made to celebrate circumcisions of Ottoman Princes, the first Surname was commissioned in 1524 for a wedding ceremony.

Heavy Seas Beer: Heavy Seas Beer is brewed by Clipper City Brewing Company, in Baltimore, Maryland.  The brewery was established by Hugh Sisson in 1995.  Previously, Sisson operated Maryland's first brewpub, Sisson's.  In 2010, the brewery rebranded.  While the name of the company remains Clipper City Brewing Company, all of its beer falls under the Heavy Seas brand.  Heavy Seas hosts tours on most weekends.  It is located at 4615 Hollins Ferry Road, Suite B, in the Halethorpe section of Baltimore.  Heavy Seas currently offers a variety of beer styles in approx. 18 states within the United States.  Several Heavy Seas beers have been awarded and include the following: Cutlass Amber Lager (a repeat medal winner at the Great American Beer Festival from 2006-2010, bronze medal winner at the 2010 World Beer Cup and silver medal winner at the 2012 World Beer Cup as Heavy Seas Märzen), Powder Monkey Pale Ale (silver medal winner at the 2008 Great American Beer Festival and bronze medal winner at the 2010 World Beer Cup as Heavy Seas Pale Ale), Small Craft Warning Uber Pils (bronze medal winner at the 2004 Great American Beer Festival), Gold Ale (gold medal winner at the 2010 World Beer Cup, bronze medal winner at the 2010 Great American Beer Festival and bronze medal winner at the 2014 Great American Beer Festival as Heavy Seas Gold Ale) and Winter Storm Imperial ESB (gold medal winner at the 2008 World Beer Cup).

Imperial (beer): Imperial (Cerveza Imperial) is a Costa Rican brand of beer, manufactured by the Florida Ice & Farm Company (FIFCO).  Imperial, a lager, was first produced by the Ortega brewery in 1924 and is the most popular beer in Costa Rica.  It has spun off "Imperial Light" and "Imperial Silver".  FIFCO produces other beers including its "Pilsen", "Bavaria", and "Rock Ice" brands.

Estrella Damm: Estrella Damm is a lager beer, brewed in Barcelona, Spain.  It has existed since 1876, when August Küntzmann Damm founded his brewery in Barcelona, and is the flagship beer of S.A. Damm, a prominent brewery in the city.  The brand is the oldest in Spain and the name "Estrella" means "star" in both Catalan and Spanish.  Estrella Damm is available in many countries, including Australia, Brazil, Bulgaria, Canada, Cyprus, Croatia, Greece, Ukraine, Norway, Poland, Portugal, Sweden, Taiwan, Georgia, Honduras and the UK in a 4.6% version.  In the United States, it is available through United States Beverage, LLC.  Despite its name, Estrella Damm should not be confused with another Spanish lager, called Estrella Galicia.

Hogsback Brewing Company: Hogsback Brewing Company is an Ottawa based microbrewery which first began brewing in the Spring of 2010.  There flagship beer is Hogsback Vintage Lager, a European-inspired lager with flavour derived from combining three malt types (2-Row, Munich and Vienna), unique Saaz hops and German lager yeast.

Summit Brewing Company: Summit Brewing Company is a regional craft brewery in Saint Paul, Minnesota, United States, that brews a wide selection of popular beers.  It is sometimes mistakenly believed to be a microbrewery, even though Summit's output is in the top 50 of breweries in the United States, with approximately 129,000 barrels of beer produced in 2015, and a capacity of 240,000 barrels per year.  Their flagship beer, an English Pale Ale (branded "Summit Extra Pale Ale") is especially popular in the Twin Cities area.

Supporting paragraphs: Festival Imperial Imperial (beer)
Answer: Florida Ice & Farm Company