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James Bellis with Make Decent Coffee shows visitors how to use the pour-over coffee method at the 2014 London Coffee Festival on Saturday, April 5, 2014.

James Bellis with Make Decent Coffee shows visitors how to use the pour-over coffee method at the 2014 London Coffee Festival on Saturday, April 5, 2014. (Adam L. Mathis/Stars and Stripes)

James Bellis with Make Decent Coffee shows visitors how to use the pour-over coffee method at the 2014 London Coffee Festival on Saturday, April 5, 2014.

James Bellis with Make Decent Coffee shows visitors how to use the pour-over coffee method at the 2014 London Coffee Festival on Saturday, April 5, 2014. (Adam L. Mathis/Stars and Stripes)

Veryan Jones with Make Decent Coffee, shows spectators how to use an Aero Press at the 2014 London Coffee Festival on Saturday, April 5, 2014. The festival featured vendors who offer free samples and instructions on how to make coffee.

Veryan Jones with Make Decent Coffee, shows spectators how to use an Aero Press at the 2014 London Coffee Festival on Saturday, April 5, 2014. The festival featured vendors who offer free samples and instructions on how to make coffee. (Adam L. Mathis/Stars and Stripes)

A coffee expert pours grounds into a press pot at the coffee lounge during the 2014 London Coffee Festival on Saturday, April 5, 2014. Visitors to the lounge could get lessons on how to make better coffee using a press pot, pour over and Aero Press.

A coffee expert pours grounds into a press pot at the coffee lounge during the 2014 London Coffee Festival on Saturday, April 5, 2014. Visitors to the lounge could get lessons on how to make better coffee using a press pot, pour over and Aero Press. (Adam L. Mathis/Stars and Stripes)

Coffee enthusiasts at the 2014 London Coffee Festival could test their tasting skills at the Union Roastery stall. The roastery asked people to taste three cups of coffee and guess which of the three was not made from the same beans as the other two.

Coffee enthusiasts at the 2014 London Coffee Festival could test their tasting skills at the Union Roastery stall. The roastery asked people to taste three cups of coffee and guess which of the three was not made from the same beans as the other two. (Adam L. Mathis/Stars and Stripes)

Turkish coffee pours into two cups at Arzum's stand at the 2014 London Coffee Festival on Saturday, April 5, 2014.

Turkish coffee pours into two cups at Arzum's stand at the 2014 London Coffee Festival on Saturday, April 5, 2014. (Adam L. Mathis/Stars and Stripes)

Hordes of coffee drinkers across England will unite at the London Coffee Festival on May Day to sate their craving for the black liquid.

More than 250 vendors will ply their wares in the Old Truman Brewery, which could barely contain the crowd last year.

The event opens to the public on Friday and continues through Sunday. The first of two industry days began Thursday. About 22,000 showed up last year, and a similar number is expected this year.

— Adam L. Mathis

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