Go on and break a sweat.
Self Magazine Workout in the Park
What: Outdoor group fitness classes are held alongside beauty consultations, nutrition seminars, giveaways, and more.
Why: There’s strength in numbers.
When: Sat., 11 a.m.-3 p.m.
Where: Butler Field, Grant Park, 350 E. Monroe St., at Michigan Ave. Tickets online at evolutioneventsonline.com.
What: Take a friend to Four Seasons Hotel Chicago and score half off a spa treatment and tea service.
Why: The Hawaiian honey body wrap pays off.
When: Thru Sept. 7. Mon.-Thurs., 8 a.m.-8 p.m. (Tea served 3-5 p.m.)
Where: 120 E. Delaware Pl., at Michigan Ave. Reservations (required) at 312-649-2340.
Open Books and Gapers Block Book Swap
What: Trade gently used reads with fellow bookworms.
Why: Leftover books fund literacy incentives.
When: Thurs., 6-9 p.m.
Where: Black Rock Pub & Kitchen, 3614 N. Damen Ave., at Addison St. (773-348-4044).
What: Just-opened bar/resto dishes American classics (burgers, pasta, fish) in a massive beer garden and on a rooftop patio.
Why: Nothing beats market value.
When: Sun.-Fri., 11 a.m.-2 a.m.; Sat., 11 a.m.-3 a.m.
Where: 1113 W. Randolph St., b/t May & Aberdeen Sts. (312-929-4787).
Helen Yi Vintage Clothing and Jewelry Trunk Show
What: Throwback clothes and accessories from major designers (Chanel, Lanvin, Halston, others).
Why: It looks better with age.
When: Thurs. & Fri., noon-6 p.m.
Where: 1645 N. Damen Ave., b/t Wabansia & North Aves. (773-252-3838).