The fights at UFC Apex can be seen on ESPN+, with the main card starting at 7 p.m. ET and the prelims at 4:30 p.m.
Ladd (9-1) was scheduled for an Oct. 2 bantamweight bout against Macy Chiasson, but Ladd missed weight and was shaky on the scale, and the fight was canceled.
Dumont (6-1) was slated to headline this event at 145 pounds against former UFC bantamweight champion Holly Holm, but Holm withdrew from the bout and Ladd was brought in as her replacement.
The card actually has lost two main events. Originally, another ex-champ at 135 pounds, Miesha Tate, was to headline against Ketlen Vieira, but Tate was pulled from the fight after a positive COVID-19 test. That matchup has since been rescheduled for Nov. 20.
How to watch the fights
Watch all of the fights on ESPN+. Download the ESPN App
Don't have ESPN+? Get it here.
There's also FightCenter, which offers live updates for every UFC card.
Saturday's fight card
ESPN+, 7 p.m. ET
Women's featherweight: Aspen Ladd vs. Norma Dumont
Heavyweight: Andrei Arlovski vs. Carlos Felipe
Lightweight: Jim Miller vs. Erick Gonzalez
Women's flyweight: Manon Fiorot vs. Mayra Bueno Silva
Men's featherweight: Nate Landwehr vs. Ludovit Klein
ESPN+, 4:30 p.m. ET
Middleweight: Andrew Sanchez vs. Bruno Silva
Welterweight: Danny Roberts vs. Ramazan Emeev
Women's flyweight: Loopy Godinez vs. Luana Carolina
Men's bantamweight: Danaa Batgerel vs. Brandon Davis
Strawweight: Istela Nunes vs. Ariane Carnelossi