How to watch the Iowa Democratic debate

From left: Hillary Clinton, Bernie Sanders and Martin O’Malley at a Democratic presidential forum in South Carolina on Nov. 6, 2015. (Chuck Burton, AP)

The Democratic presidential field — Hillary Clinton, Bernie Sanders and Martin O’Malley — gathers for their second debate Saturday night.

Here’s what you need to know:

When does it start and where will it be held?

The debate will begin at 9 p.m. ET and will be held at Drake University in Des Moines.

Who will participate?

The three remaining Democratic presidential candidates: former secretary of State Hillary Clinton, Vermont Sen. Bernie Sanders and former Maryland governor Martin O’Malley.

At the first Democratic debate in Las Vegas last month, the lineup also included former Virginia senator Jim Webb and former Rhode Island governor Lincoln Chafee, but they both ended their bids not long after.

How do I watch?

The debate will be broadcast live on CBS. CBS News — which is hosting the debate along with The Des Moines Register

Who will moderate?

John Dickerson, anchor of CBS News’ Face the NationThe Register

Anything else I should know?

If you plan to weigh in on Twitter during the debate, make sure to use the official hashtag, #DemDebate. CBS News plans to highlight some tweets during the debate telecast.