WASHINGTON — The stages are set.

Twenty Democratic presidential candidates were divvied up between two planned nights of debates in a drawing by NBC News on Friday morning. The candidates will face off on June 26 and 27 at the Adrienne Arsht Center for the Performing Arts in downtown Miami.

Here is a breakdown of the two groups of candidates and the dates on which they will debate

On June 26:

Sen. Cory Booker of New Jersey

Sen. Elizabeth Warren of Massachusetts

Former Rep. Beto O'Rourke of Texas

Sen. Amy Klobuchar of Minnesota

Former Rep. John Delaney of Maryland

Rep. Tulsi Gabbard of Hawaii

Former Housing Secretary Julián Castro

Rep. Tim Ryan of Ohio

New York City Mayor Bill de Blasio

Gov. Jay Inslee of Washington

On June 27:

Sen. Bernie Sanders of Vermont

Sen. Kamala Harris of California

Former Vice President Joe Biden

South Bend, Indiana Mayor Pete Buttigieg

Sen. Michael Bennet of Colorado

Author Marianne Williamson

Rep. Eric Swalwell of California

Sen. Kirsten Gillibrand of New York

Entrepreneur Andrew Yang

Former Gov. John Hickenlooper of Colorado

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The debates will air from 9 p.m. to 11 p.m. EST on NBC, MSNBC, and Telemundo. Moderators will be Lester Holt, Savannah Guthrie, Chuck Todd, Rachel Maddow, and José Díaz-Balart.

The format of the debates will be the same on each night. Holt will appear in both hours. Guthrie and Diaz-Balart will join Holt for the first half. In the second half, Todd and Maddow will join as moderators.

As voters begin to pay more attention to the race, candidates in recent weeks have begun sharpening their message and offering a preview of arguments they may try to present on the debate stage.

It seems likely that the frontrunner Biden will face the toughest engagement to date from fellow Democrats in his nearly two-month old campaign. Biden, now running in his third presidential campaign, has sparred with Trump, but has tried to stay above the intra-party fray.

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Warren has criticized Biden for his ties to the credit card industry, including his vote in the Senate for the 2005 Bankruptcy Abuse Prevention and Consumer Protection Act, legislation that tightened rules on who could qualify for bankruptcy protection.

Sanders has gone after Biden, making the case that the “middle of the road” approach that Biden — a centrist who has billed himself as the antidote to Trump — will prove to be a loser.

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Meanwhile, South Bend, Indiana, Mayor Peter Buttigieg, 37, has driven the message that the country needs a generational change in the White House. He has poked at Trump and Biden as backward-looking candidates not best suited to take on generational challenges, such as climate change, facing the nation.

Candidates such as former Rep. John Delaney and former Gov. John Hickenlooper could use their moment on stage to hammer their shared point that Democrats need to elect a tested, moderate Democrat and that going too far to the left would be calamitous for Democrats in the general election. They’ve offered their toughest criticism for Sanders, who this week made a major speech defending his democratic socialist philosophy.

Both in recent days have railed against the embrace by some candidates for Medicare-For-All, a policy that would upend the private insurance industry, and the Green New Deal, a costly proposal to curb climate change.

Booker, Buttigieg, Harris, Sanders and Warren have all expressed support for Medicare-For-All or establishing a single-payer health care system. At least 15 candidates—including the entire top tier in the polls—have endorsed the Green New Deal.