UFC Fight Night: Allen vs. Curtis 2

UFC Fight Night: Allen vs. Curtis 2 (also known as UFC Fight Night 240, UFC on ESPN+ 98 and UFC Vegas 90) was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on April 6, 2024, at the UFC Apex facility, in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States.

Background
A middleweight bout between former UFC Middleweight Championship challenger Marvin Vettori and former LFA Middleweight Champion Brendan Allen was expected to headline the event. However on March 14, it was announced that Vettori was out due to an injury. He was replaced by Chris Curtis. The pair previously met at UFC on ESPN: Font vs. Aldo in December 2021, which Curtis won by second round TKO.

A featherweight bout between Morgan Charrière and Choi Seung-woo was scheduled for this event. However, Choi withdrew for unknown reason and was replaced by Chepe Mariscal.

A middleweight bout between Josh Fremd and César Almeida was scheduled for the event. However, Fremd withdrew from the event for unknown reasons and was replaced by Dylan Budka.

Jose Johnson and Lucas Rocha were expected to meet in a flyweight bout. However, Johnson pulled out due to undisclosed reasons and was replaced by Joshua Van. In turn, Rocha withdrew due to injury and the bout was scrapped.

Alateng Heili was expected to face Victor Hugo in a bantamweight bout at the event. However, Alateng pulled out due to illness on fight week and promotional newcomer Pedro Falcão stepped in as a replacement on three days' notice.

At the weigh-ins, four fighters missed weight:
 * Alexander Hernandez weighed in at 147.5 pounds, one and a half pounds over the featherweight non-title fight limit. His bout proceeded at catchweight and he was fined 20% of his purse, which went to his opponent Damon Jackson.
 * Cynthia Calvillo weighed in at 119 pounds, three pounds over the strawweight non-title fight limit. As a result, her bout with former LFA Women's Strawweight Champion Piera Rodriguez was cancelled.
 * Nora Cornolle and Melissa Mullins weighed in at 138.5 and 138 pounds, 2 and a half and 2 pounds over the bantamweight non-title fight limit respectively. Their bout proceeded at catchweight with neither being issued a fine.

Bonus awards
The following fighters received $50,000 bonuses.
 * Fight of the Night: Jose Mariscal vs. Morgan Charrière
 * Performance of the Night: Ignacio Bahamondes and César Almeida