This event was initially planned to take place at Astana Arena in Nur-Sultan, Kazakhstan and would have been the first that the promotion had contested there. However, it was announced by UFC president Dana White on April 9 that starting with UFC 249, all future events were indefinitely postponed due to the COVID-19 pandemic.
A flyweight bout between promotional newcomer Zhalgas Zhumagulov and Jordan Espinosa was initially scheduled for the event when it was targeted for Kazakhstan. However, due to travel restrictions related to COVID-19 pandemic, Zhumagulov was removed from the card after the event was moved to Las Vegas. Espinosa instead would face Mark De La Rosa in a bantamweight bout.
Additionally, the event included fighters that were pulled from other events previously cancelled, as well as the following bouts:
A women's flyweight bout between Melissa Gatto and Mariya Agapova was scheduled for the event, but Gatto pulled out on June 7 due to visa issues. She was replaced by Hannah Cifers.
A flyweight bout between Tyson Nam and Ryan Benoit was scheduled for the event. However, Benoit withdrew due to undisclosed reasons and was replaced by promotional newcomer Zarrukh Adashev, thus changing the contest to the bantamweight division.
At the weigh-ins, Eye, Roberson and Adashev all missed weight for their respective bouts. Eye weighed in at 126.25 pounds, a quarter pound over the flyweight non-title fight limit. Roberson weighed in at 190.5 pounds, four and a half pounds over the middleweight non-title fight limit and Adashev weighed in at 138.5 pounds, two and a half pounds over the bantamweight non-title fight limit. Their bouts proceeded at a catchweight and they were respectively fined 25%, 30% and 20% of their individual purses, which went to their opponents Calvillo, Vettori and Nam.
The following fighters received $50,000 bonuses.
Fight of the Night: No bonus awarded.
Performance of the Night: Marvin Vettori, Mariya Agapova, Tyson Nam and Christian Aguilera
The following is the reported payout to the fighters as reported to the Nevada State Athletic Commission (NSAC). It does not include sponsor money and also does not include the UFC's traditional "fight night" bonuses. The total disclosed payout for the event was $782,000.
Christian Aguilera: $24,000 (includes $12,000 win bonus) def. Anthony Ivy: $12,000
^ Eye ($12,750), Roberson ($12,000) and Adashev ($2,800) were respectively fined 25%, 30% and 20% of their purses for failing to make the required weight limit for each of their respective fights. That money was issued to their opponents, a NSAC official confirmed.