Final answer:
The main venue where the Beatles performed in Liverpool is the iconic Cavern Club, where they played nearly 300 times and which served as a significant platform for their early career.
Step-by-step explanation:
The main venue where the Beatles performed in Liverpool is the iconic Cavern Club. A pivotal location in the Beatles' early career, it is here that they honed their skills and gained popularity before becoming a worldwide phenomenon. With its intimate setting and regular performances, the Cavern Club quickly became synonymous with the Merseybeat sound that characterized the Beatles and other Liverpool bands of the time.
The venue's influence on the group's development cannot be overstated. The Beatles played at the Cavern Club nearly 300 times between 1961 and 1963. This historic spot remains a tourist attraction and a symbol of the Beatles' legacy, encapsulating the spirit of the era when the band was in its formative years and the cultural hub that Liverpool was during the 1960s.