A wave of swimmers start their race in Lake Michigan at the 2015 Chicago Triathlon. (Courtesy of Transamerica Chicago Triathlon)

Cheer on Chicago athletes, shop for fall accessories, take in an outdoor movie, sip sangria on a sprawling lawn, run through mud, watch dashing dogs and more this weekend.

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More than 6,500 athletes compete this weekend

2014 ITU World Triathlon Chicago (Delly Carr / ITU Media)

Chicago lost out on the Olympics to Rio but this week, world titles will be at stake as 6,500 pro- and age-group triathletes compete in the ITU World Triathlon Grand Final and World Championships. Chicago Tonight's Elizabeth Brackett will be one of them – she tells us what to expect.