So, the speaker lineup for the convention has been announced, per Vox:
https://www.vox.com/2020/8/11/21362326/democratic-national-convention-speaker-lineup-how-to-watchNotably, Harris, Warren, and Whitmer have their own slots alongside the unannounced VP slot.
Monday:
Former first lady Michelle Obama
Sen. Bernie Sanders (I-VT)
Michigan Gov. Gretchen Whitmer New York Gov. Andrew Cuomo
House Majority Whip Jim Clyburn
Former Ohio Gov. John Kasich, a 2016 Republican presidential candidate
Sen. Amy Klobuchar (D-MN)
Sen. Catherine Cortez Masto (D-NV), chair of the Democratic Senatorial Campaign Committee
Rep. Bennie Thompson (D-MS), chair of the House Committee on Homeland Security
Sen. Doug Jones (D-AL)
Rep. Gwen Moore (D-WI)
Tuesday:
Dr. Jill Biden
Former President Bill Clinton
Former Secretary of State John Kerry
Rep. Alexandria Ocasio-Cortez (D-NY)
Senate Minority Leader Chuck Schumer
Former US Attorney General Sally Yates
Rep. Lisa Blunt Rochester (D-DE)
Wednesday:
Former President Barack Obama
Joe Biden’s yet-to-be-announced vice presidential candidate House Speaker Nancy Pelosi
Former Secretary of State Hillary Clinton, the 2016 Democratic nominee for president
Sen. Elizabeth Warren (D-MA) Former Rep. Gabby Giffords, a prominent gun control advocate
New Mexico Gov. Michelle Lujan Grisham
Wisconsin Gov. Tony Evers
Thursday:
Former Vice President Joe Biden accepts the Democratic nomination
Members of the Biden family
Sen. Kamala Harris (D-CA) Sen. Cory Booker (D-NJ)
California Gov. Gavin Newsom
Atlanta Mayor Keisha Lance Bottoms
Former South Bend, Indiana, Mayor Pete Buttigieg
Sen. Tammy Baldwin (D-WI)
Sen. Tammy Duckworth (D-IL)
Sen. Chris Coons (D-DE)