Bring out your inner Nancy Drew as you scour through some of Downtown Denver's most historic landmarks in teams up to four people. With a passport and clues in-hand, complete various mental, physical, and sometimes humorous challenges. Afterward, celebrate the hunt with an infamous Rio Grande margarita. Fundraising benefits Brent's Place, a community home providing children battling cancer and their families a safe living environment essential to healing and recovery. Sat 9 a.m.