Question: The fair that features organic food in Unity, Maine takes place in which county? 

Context paragraphs:
Maine Organic Farmers and Gardeners Association: The Maine Organic Farmers and Gardeners Association (MOFGA) certifies organic food and products throughout the State of Maine.  It is a voluntary organization whose office is located in Unity, Maine.  As of 2016, MOFGA certifies 480 producers and growers.

BioFach: BioFach is the world's largest trade fair for organic food and agriculture.  It is held each year in the month of February, in Nuremberg, Germany.  It brings together 2774 exhibitors and approximately 46700 trade visitors from around 130 countries.

Organic food: Organic food is food produced by methods that comply with the standards of organic farming.  Standards vary worldwide, but organic farming in general features practices that strive to cycle resources, promote ecological balance, and conserve biodiversity.  Organizations regulating organic products may restrict the use of certain pesticides and fertilizers in farming.  In general, organic foods are also usually not processed using irradiation, industrial solvents or synthetic food additives.

Common Ground Country Fair: The Common Ground Country Fair is a fair in Unity, Maine sponsored by the Maine Organic Farmers and Gardeners Association (MOFGA).  The fair began in 1977 in Litchfield, Maine.  In 1981, it moved to Windsor, Maine and in 1996, MOFGA purchased 200 acres in Unity, Maine, where the fair now takes places yearly.  The fair "celebrates organic living, farming and growing," and all the food sold at the event must be organic.  The fair regularly hosts 50,000 to 60,000 people.

Weaver Street Market: Weaver Street Market is a worker- and consumer-owned cooperative selling natural and organic food with a focus on local and fair trade products.  The original market is situated in the heart of Carrboro, North Carolina in Carr Mill Mall and plays host to a large number of community events.  It occupies a central location in the town of Carrboro and serves as a "community gathering place."

HalloWeekends: HalloWeekends is an annual Halloween event at Cedar Point amusement park in Sandusky, Ohio.  It was introduced in 1997, and takes place during the Halloween season, usually from the second Friday after Labor Day until the Sunday before Halloween.  The event is open on Friday nights, Saturdays and Sundays.  It is included free with park admission.  As of 2014, HalloWeekends features 11 haunted houses and nighttime scare zones, and there are several children's attractions including a parade that takes place on the main midway.  It is advised that children under 13 years old be accompanied by an adult.  HalloWeekend's yearly slogan is "All You Fear is Here!" .  Other Cedar Fair parks including Dorney Park, Valley Fair, and Worlds of Fun all have formerly used the HalloWeekends name.  The name has changed to Halloween Haunt at all 3 parks.  Cedar Point is the only Cedar Fair park that still uses the HalloWeekends name.

Sustainability standards and certification: Sustainability standards and certifications are voluntary, usually third party-assessed, norms and standards relating to environmental, social, ethical and food safety issues, adopted by companies to demonstrate the performance of their organizations or products in specific areas.  There are perhaps up to 500 such standards and the pace of introduction has increased in the last decade .  The trend started in the late 1980s and 90s with the introduction of Ecolabels and standards for Organic food and other products.  In recent years, numerous standards have been established and adopted in the food industry in particular .  Most of them refer to the triple bottom line of environmental quality, social equity, and economic prosperity.  A standard is normally developed by a broad range of stakeholders and experts in a particular sector and includes a set of practices or criteria for how a crop should be sustainable grown or a resource should be ethically harvested.  This might cover, for instance, responsible fishing practices that don't endanger marine biodiversity, or respect for human rights and the payment of fair wages on a coffee or tea plantation.  Normally sustainability standards are accompanied by a verification process - often referred to as "certification" - to evaluate that an enterprise complies with a standard, as well as a traceability process for certified products to be sold along the supply chain, often resulting in a consumer-facing label.  Certification programmes also focus on capacity building and working with partners and other organisations to support smallholders or disadvantaged producers to make the social and environmental improvements needed to meet the standard.

Vivani: Vivani Organic Chocolate is a brand of chocolate created by EcoFinia GmbH, a subsidiary of Ludwig Weinrich GmbH & Co.  KG., based in Herford, Germany.  First introduced in 2000 at the international organic food fair, BioFach, "Vivani" chocolate is predominantly sold in organic supermarkets and shops, where it claims market leadership in organic chocolate bars.

Stuttgart Spring Festival: Stuttgart Spring Festival (in German called Stuttgarter Frühlingsfest or sometimes vernacular Cannstatter Wasen or just Wasen) is an annual fair that takes place in the German city of Stuttgart between the middle of April and the beginning of May.  The festival takes place on the "Cannstatter Wasen", traditional fairgrounds in Stuttgart's Bad Cannstatt district.  It is slightly smaller than the festival in the autumn (and therefore occasionally also called the "small Wasen"), but it is the largest spring festival in Europe.  Like the autumn fair, the Frühlingsfest offers a variety of fairground attractions.  The tallest attraction is the 47 metre Ferris wheel and the fair almost invariably features a major roller coaster.

Unity, Maine: Unity is a town in Waldo County, Maine, United States.  The population was 2,099 at the 2010 census.  The town is the service center for the northern portion of Waldo County.  Outside of Waldo county, it is best known as the home of the Maine Organic Farmers and Gardeners Association, its Common Ground Country Fair and Unity College.  Unity College was founded in 1965 to offset the economic effects of the declining chicken farming industry.  As of 2007, the college is the town's largest employer.

Supporting paragraphs: Common Ground Country Fair Unity, Maine
Answer: Waldo County