The long: For the first time, typically grownups-only DesignPhiladelphia hosts kid-friendly events. Turns out, children learn through playing with (and on) cool objects.
The short: Do you wanna build a playground?
All week long: "The Art of Active Play" series at Smith Memorial Playground begins with a grownup-oriented talk (6-8 p.m. Thursday, $10), continues with the visit of three simple yet innovative play structures - a wacky bench, a tricked-out balance beam and a mini gym, all designed and built by Philly kids working with the Community Design Collaborative as part of its Play Space initiative - temporary companions to the famous big wooden slide.
3500 Reservoir Drive, 10 a.m.-4 p.m. Thursday-Oct. 16, free, 215-765-4325, smithplayground.org
Schuylkill River Park, 25th and Spruce streets, noon-5 p.m. Saturday, free
Sunday: The Chemical Heritage Foundation invites middle-schoolers and older to tour mini labs, build hydrodynamic models and hack science games (315 Chestnut St., 1-4 p.m. Sunday, $5, free under 5, 215-925-2222, chemheritage.org).
Monday: Smith Memorial opens next (no-school) Monday for little-known national holiday Family Play Day, for BYO picnic and play midday.
11 a.m.-2 p.m. Monday, free, registration required
Basics: DesignPhiladelphia, various locations, Thursday-Oct. 16, fees vary, 2015.designphiladelphia.org.