The crowded field of 20 Democrats hoping to take on President Trump in the 2020 election will face off in a series of televised debates Tuesday and Wednesday night. Here’s what you need to know before tuning in.

When is the second 2019 Democratic presidential debate?

The debates will air on CNN starting at 8 p.m. Eastern time Tuesday and Wednesday. Each is expected to last about 2½ hours and include three commercial breaks.

Can the 2019 presidential debates be livestreamed online?

Yes, the debates can be streamed on CNN’s homepage without needing a cable subscription. They will be available on demand the day after they air via the outlet’s website, as well as smartphone and tablet apps.

Who is moderating the debate?

CNN’s chief political correspondent Dana Bash, anchor Don Lemon and Washington correspondent Jake Tapper will be asking the questions — and corralling the candidates.

Who will be in Tuesday’s first round of the second Democratic debate?

Rep. Beto O’Rourke of Texas, Montana Gov. Steve Bullock, author and activist Marianne Williamson, former Rep. John Delaney, former Colorado Gov. John Hickenlooper, Rep. Tim Ryan of Ohio, Minnesota Sen. Amy Klobuchar, South Bend, Indiana, Mayor Pete Buttigieg, Sen. Elizabeth Warren of Massachusetts and Vermont Sen. Bernie Sanders.

And who will debate Wednesday?

Former Vice President Joe Biden, California Sen. Kamala Harris, New York City Mayor Bill de Blasio, Washington Gov. Jay Inslee, Sen. Kirsten Gillibrand of New York, Rep. Tulsi Gabbard of Hawaii, Colorado Sen. Michael Bennet, New Jersey Sen. Cory Booker, entrepreneur Andrew Yang and Julián Castro, former housing secretary in the Obama administration.

What are the rules for the second 2019 Democratic presidential debate?

Debaters will get one minute each for introductions and closing statements.

Moderators will pose questions and give candidates 60 seconds to answer. They’ll also get 30 seconds for responses and rebuttals.

If a hopeful is attacked by name by another candidate, they will get 30 seconds to respond.

Candidates who consistently interrupt others will lose time.

Who will be in the audience?

The Democratic National Committee and CNN selected 3,500 people for the invite-only live audience. They will not be allowed to raise their hands to pose questions.

Who is expected to get the most speaking time?

The odds-makers at Sportsbetting.ag say Buttigieg will likely get the most time in the spotlight on Tuesday, followed by Warren and Sanders, while Harris, Biden and Booker will edge out the rest of the field on Wednesday.