The fourth-round 2020 Democratic presidential debate is set for Tuesday night in Ohio, with 12 candidates set to take the stage, one of them for the first time. Here is everything you need to know.

When and where is the debate? 

The debate will start at 8 p.m. EST and will be held at Otterbein University in Westerville, Ohio, near Columbus. The event will air on CNN and CNN en Español, as well as several local NPR stations.

Who is participating? 

Twelve contenders qualified for this month’s debate after meeting the DNC requirements: a minimum of 130,000 unique donors and at least 2% support in four or more approved state or national polls. These were the same requirements the DNC established for the September debate. Here are the 12 candidates who will face off on Tuesday night:

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Steyer, who is famous for his “Need to Impeach” campaign against President Donald Trumpis the only 2020 Democratic candidate who has not yet participated in a debate. Viewers can expect Steyer — along with nearly every other candidate — to comment at least once on whether or not Trump should be removed from office for enlisting foreign powers for personal or political gain.

Biden is set to take center stage, even though several recent polls have Warren leading the former vice president for the 2020 Democratic nomination after a rise in support. The Massachusetts Senator and fellow progressive Sanders will each stand beside Biden onstage Tuesday night.

Who is moderating the debate?

CNN anchors Anderson Cooper and Erin Burnett and New York Times national editor Marc Lacey will serve as moderators for Tuesday’s debate.