Inspired by the Grand Slam of Ultra Running the Calico Slam recognizes runners completing multiple Calico Racing events .
Ultra Running is the completion of the 4 premier 100 miler events in the country in one year .
Inspired by the Grand Slam of Ultra Running , which is the completion of the 4 premier 100 miler events in the country in one year , the Calico Slam recognizes runners completing multiple Calico Racing events .