Cupid's Undie Run - I'm with Cupid --- What is cupid's undie run? Cupid’s Undie Run is a mile(ish) run in your bedroom-best on Valentine’s weekend. No, we’re not crazy, we’re just crazy serious about raising money for The Children’s Tumor Foundation. We raised over $1.3 Million in donations last year, so come join the fun and help us hit $3 Million for 2014! Festivities start mid-day on Saturday, February 15th* 2014. Check to see if there are events in your community!