July 25, 2016 8:47 PM EDT

The Democratic National Convention kicks off in Philadelphia Monday with speeches from the First Lady, a former Hillary Clinton rival and people Clinton met throughout her political career.

Here’s a quick guide to the major speakers.

Bernie Sanders

With the primaries behind him, Vermont Sen. Bernie Sanders has chosen to support Clinton instead of push for a contested convention—a delegate fight he almost certainly would have lost. Sanders will speak at a relatively low-profile slot in the convention schedule. Earlier this month, Sanders endorsed Clinton at an event in New Hampshire. His Monday speech will be closely watched, especially in the wake of protests at the convention’s opening.

Hillary Clinton attends a rally with Senator Bernie Sanders at Portsmouth High School Gymnasium in Portsmouth, New Hampshire on July 12, 2016.
(The Washington Post—The Washington Post/Getty Images)

Michelle Obama

The First Lady will be the keynote speech Monday night to kick off the convention. The wife of a skilled orator, Michelle initially left major public speaking to her husband. But at the 2008 Democratic convention, she gave a speech that humanized her husband and propelled her to widespread approval—and was later borrowed for Melania Trump’s speech.

Michelle Obama takes questions from children for Take Our Daughters and Sons to Work Day in the White House on April 20, 2016 in Washington, D.C.
(Chip Somodevilla—Getty Images)

Elizabeth Warren

In a primetime address, Massachusetts Sen. Elizabeth Warren will also vouch for Clinton’s progressive bona fides. Warren endorsed Clinton after staying neutral throughout the primary. The former Harvard Law School professor has lately been on the attack against Republican nominee Donald Trump and was mentioned as a potential contender for Clinton’s running mate.

Democratic presidential candidate Hillary Clinton, accompanied by Sen. Elizabeth Warren, D-Mass., arrives to speak at the Cincinnati Museum Center at Union Terminal in Cincinnati, Monday.
(Andrew Harnik—AP)

Cory Booker

Another vice presidential contender, New Jersey Sen. Cory Booker is a rising star in the Democratic party. Elected to the Senate in 2012, he was previously mayor of Newark for six years. When he was campaigning for mayor, Booker made fixing public safety the cornerstone of his campaign. “You know that if a kid gets shot, every one of the issues you care about gets undermined?” Booker told TIME in 2010. That year, Booker drew a gift of $100 million from Facebook creator Mark Zuckerburg for Newark’s public schools system. The senator is especially active on Twitter.

Cory Booker introduces Democratic presidential candidate Hillary Clinton at a campaign event in Marion, IO on Jan. 24, 2016.
(Brendan Hoffman—Getty Images)

Astrid Silva

An immigrant from Mexico, Astrid Silva became a face for immigration reform in 2014 when she expressed fear her father may be deported around Christmas. She defended President Obama’s executive actions on immigration which provided temporary relief for 5 million undocumented immigrants in the country who may be deported.

Immigration activist Astrid Silva (in red) stands next to her mother, Barbara Silva, as she speaks about immigration reform at a news conference on Capitol Hill in Washington, Dec. 10, 2014.
(Larry Downing—Reuters)

Pam Livengood

When Clinton campaigned in the New Hampshire primary, the issue of opioid abuse was high on the minds of many voters. Pam Livengood, a Keene resident, know addiction problems too well. Livengood’s daughter struggles with substance abuse to the point Pam and her husband have become guardians of their daughter’s son. Pam raised the issue at a roundtable in May 2015 with Clinton.

Hillary Clinton participates in a round table discussion with Pam Livengood, middle left, and Whitney Brothers management and employees in Keene, N.H. on April 20, 2015.
(Don Emmert—AFP/Getty Images)

Anastasia Somoza

Anastasia Somoza has known the Clintons for years. She met then-President Bill Clinton at a town hall for children in 1993. Somoza has cerebral palsy and spastic quadriplegia, disabilities that confine her to a wheelchair. Somoza has graduated from Georgetown, speaks regularly about disability rights and works with the Clinton Foundation.

Oliver Somoza, Mary Somoza, Gerardo Somoza, Gabriella Somoza, Alba Somoza and Anastasia Somoza attend the The Shield Institute and Pure Vision Arts Celebration at Metropolitan West in New York City
(Daniel Zuchnik—WireImage)

Karla and Francisca Ortiz

At a campaign event in Feburary, Clinton met Karla Ortiz, a 10-year-old Nevadan who said she is worried her undocumented parents may be deported. Clinton featured her exchange with Ortiz in a campaign ad, saying she will do “everything I can” to make sure immigrants like Ortiz’s parents can stay in the U.S. Karla and her mother, Francisca, will speak at the convention.

Contact us at letters@time.com.

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