Why did Cardi B need an oxygen mask backstage during her Denver concert?

AI BRIEFING

• ⬤ Cardi B needed an oxygen mask backstage due to a reported medical issue, but details about the nature of the issue were not disclosed.
• ⬤ The Oxygen4All Foundation, which supports patients with sickle cell disease, was also honored during the concert.
• ⬤ The concert resumed after a brief delay, with Cardi B performing without further incident.