I ran in my first big (I mean, BIG) group race in April 2011. It is the Crazylegs 5-mile race in Madison, WI, and 30,000 participated this year.
"We made our legs crazy at the 30th annual Crazylegs Classic race in Madison, WI, on April 30, 2011! Benefiting the UW-Madison athletic dept., the 5-mile course took 30,000 runners from the State Capitol, then through the campus, then to the grand finish at the 50-yard line inside the Badgers football stadium. I really enjoyed the run - so many people, so many new sights, so much energy, so fun! I have already marked my calendar for Crazylegs in 2012!"