Boxing at Barclays, with five events in 2019 and 2020, said to be still going strong, but initial expectations were twice as busy

BoxingScene, in the 12/24/19, Barclays Center Exec: I Don't See Any Signs Of Us Slowing Down, reports that Barclays Center booking chief Keith Sheldon will maintain the boxing schedule:

Barclays Center hosted five boxing cards in 2019, just one fewer than the six apiece held at the 7-year-old venue in 2017 and 2018. Sheldon anticipates a similar number of boxing events next year at Barclays Center, which has a partnership with Al Haymon’s Premier Boxing Champions.
Sheldon has been instrumental in building the Brooklyn Boxing brand for six years. He emphasized that almost the entire group – which also includes Anthony Catanzaro, the Barclays Center’s senior boxing adviser – responsible for the program’s success remains intact.

Some have drawn big TV crowds, so it's not all about volume and attendance, but do note they've fallen short from initial expectations.

Though Barclays had “signed a three-year deal with Golden Boy Promotions to book 12 fight events annually,” according to Sports Business Journal 7/12/10, it instead averaged about half that in the first four years, as reported within the Official Statement for the 2016 arena bond refinancing.