After two rounds of back-to-back debate nights over the summer, the next Democratic presidential debate will be a one-night affair.

Candidates had until 11:59 p.m. on Wednesday to meet the Democratic National Committee’s qualification requirements: amassing 130,000 individual donors and receiving 2 percent support in at least four qualifying polls. Only 10 candidates made the cut, meaning they will all fit on one stage under rules set by the D.N.C. Those candidates are:

The debate will be held in Houston on Sept. 12, from 8 to 11 p.m. Eastern time, and will be broadcast on ABC and Univision. The moderators will be George Stephanopoulos, David Muir, Linsey Davis and Jorge Ramos.

On Saturday, the D.N.C. said it would hold another debate in Ohio on Oct. 15. If 11 or more candidates end up qualifying — in other words, one more candidate than the current 10 who have qualified — a second debate will be held Oct. 16. The deadline to accumulate qualifying polls and donors to make that debate is 11:59 p.m. on Oct. 1.

[Update, Sept. 8: Tom Steyer became the 11th candidate to qualify for the October debate.]

For the September debate, the one-night format means the leading candidates will all share the stage for the first time. Because of the size of the previous debate fields, two of the highest-polling candidates, Mr. Biden and Ms. Warren, have yet to face each other directly. But on Sept. 12, they will be next to each other at center stage, ABC News said Thursday.