Jayla Sheffield, 15, looked to her left and right. She and six friends, all wearing black shorts, white Nikes and T-shirts with the words “Jayla’s Quince,” paused, ready to kick off a night of festivities with a dance routine they had practiced for months.

The occasion, which brought over 100 people together in Pomona, Calif., was what Jayla and her mother, Miranda Sheffield, were calling a “quincenegra” — a term they adopted to honor Jayla’s Afro-Latina background as well as the traditional coming-of-age customs of a classic quinceañera.

Jayla gave a final nod, and the girls flung out their arms and started a hip-hop dance medley. It featured fluid twists and turns, set to pop songs by Cardi B and Bruno Mars along with punta music from Honduras, where Jayla’s father was born.