Final answer:
The Sunset Strip in Los Angeles is known for being a hub where young people congregated for concerts and cultural events, shaping the city's music scene and youth culture.
Step-by-step explanation:
The street in Los Angeles where young people congregated and went to concerts, contributing to a vibrant music and cultural scene, was the Sunset Strip. This iconic stretch of Sunset Boulevard became a hub for rock and roll culture, known for its music clubs, nightlife, and rebellious spirit, particularly during the 1960s and 1970s. The Sunset Strip attracted youth seeking to embrace the countercultural movement, attend live music performances by popular and emerging artists, and participate in the free-spirited ambiance of the era. Although not directly related to the provided references, the Strip is infamous for its role in rock history and the evolution of youth culture in Los Angeles.