The Democratic National Committee has released the names of the 20 presidential candidates who have qualified for the first debates on June 26 and 27 in Miami.

Why it matters: The back-to-back nights of debates will feature one of the most diverse and crowded Democratic fields in history. Four candidates — Montana Gov. Steve Bullock; former Alaska Sen. Mike Gravel; Miramar, Florida Mayor Wayne Messam and Massachusetts Rep. Seth Moulton — did not qualify.

The participants

Sen. Michael Bennet of Colorado Former Vice President Joe Biden* Sen. Cory Booker of New Jersey* South Bend, Indiana Mayor Pete Buttigieg* Former Housing Secretary Julián Castro* New York City Mayor Bill de Blasio Former Rep. John Delaney of Maryland Rep. Tulsi Gabbard of Hawaii* Sen. Kirsten Gillibrand of New York* Sen. Kamala Harris of California* Former Gov. John Hickenlooper of Colorado Gov. Jay Inslee of Washington* Sen. Amy Klobuchar of Minnesota* Former Rep. Beto O'Rourke of Texas* Rep. Tim Ryan of Ohio Sen. Bernie Sanders of Vermont* Rep. Eric Swalwell of California Sen. Elizabeth Warren of Massachusetts* Author Marianne Williamson* Entrepreneur Andrew Yang*

*The candidates with asterisks next to their names qualified through both polling and by reaching the 65,000 donor threshold.

What to watch: The campaigns that qualified will participate in a random drawing at 30 Rock to determine Friday afternoon to determine which night the candidates will appear, a Democratic source tells Axios' Alexi McCammond.

Go deeper: What you need to know about every 2020 candidate in under 500 words