Locoh-Donou, S., Guofen, Y., Welcher, M., et al. (2013). Mass-Gathering Medicine: A Descriptive Analysis of a Range of Mass-Gathering Event Types. (Abstract only.) American Journal of Emergency Medicine. 31(5): 843-846.
The authors reviewed cases from two years' worth of planned mass gathering events to determine the nature of illness/ injury. They found most cases were mild; the average patient age was 33 years old and female.