How many people have seen the Grateful Dead live?

Estimating the total number of people who have seen The Grateful Dead live is challenging, but it's generally believed that several million fans attended their concerts over the band's active years from 1965 to 1995. With an average audience of around 20,000 per show and thousands of performances, the attendance figures add up significantly. Additionally, many fans attended multiple shows, further increasing the total number of unique concert experiences.