Sen. Elizabeth Warren (D-Mass.). (SAUL LOEB/AFP/Getty Images)

The Democratic National Convention is likely to open with a showcase of some of the party's biggest stars, including Sen. Elizabeth Warren (D-Mass.), Sen. Bernie Sanders of Vermont, and first lady Michelle Obama, according to a source with knowledge of the convention planning.

Although the speaking schedule isn't yet set in stone, the jam-packed Monday night is also expected to include Sen. Cory Booker (D-N.J.), and Rep. Joe Kennedy (D-Mass.) will introduce Warren in Philadelphia.

Sanders's name will be entered into the nomination, prompting a roll call vote of delegates for both candidates.

According to another source familiar with the convention planning, the night's theme will be an economic agenda focused on families. The list of speakers is intended to highlight the unity of the Democratic Party in contrast to the Republican convention that will have come the week before.

The night's programming, including the speakers and videos, will drive home the theme of Clinton's campaign, "Stronger together," by highlighting a populist economic agenda.

The convention speaking list is coming together this week, and more speakers are likely to be formally announced as early as this week.

A major factor that could scramble speaking plans is Clinton's vice-presidential pick. That person is likely to speak later in the week on a big night focused on introducing them to the party and to the country. Warren is being vetted as a potential running mate.

It is not unprecedented for speakers to be announced and then -- as was the case for former North Carolina Sen. John Edwards in 2004 -- one of them is selected as the vice-presidential pick.