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Pi Day “Pi K” Fun Run 2023

11th Annual Celebration of the BEST HOLIDAY EVER!

We’re gearing up for EVERYBODY’S favorite “holiday” — PI DAY! Registration is now open for ISC’s 3.14-mile “Pi K” Fun Run followed by pie-flavored donuts and other circular treats. Mid-March is the perfect time to treat your body to some exercise, and your tastebuds to delicious treats, so join the fun!! All proceeds support the STEM outreach efforts of Illinois Science Council, an independent 501c3 nonprofit based in Chicago that offers creative, engaging science programs for teens and adults. Here’s how it works:


Register early (by midnight Thursday, February 23) and you’ll get this year’s awesome PiK t-shirt mailed directly to you to wear on Pi Day.

Register later (2/24 until midnight March 14) to have your collectible PiK t-shirt mailed after Pi Day.

Group Discount >> If you register a group of 4 or more together, you’ll get $3.14 off each registration!

All registrants receive this year’s coveted Pi K t-shirt they can wear proudly to show their respect for math and support of science outreach.

2. “RUN” 3.14:

In Person: Come to Chicago’s South Loop Fleet Feet Sports running store on Pi Day, March 14. Arrive to be ready for the run start at 6:28pm CT (2 Pi!!) There is gear check at the store and we’ll have a 3.14-mile route mapped out for you. When you get back we’ll have delicious treats to enjoy in celebration of everything circular.

Virtual: You should run, walk, skip, cartwheel, or saunter 3.14 miles, which is a little more than a 5K. (It’s the honor system. We won’t know if you spent 3.14 hours on your couch.) You can also go 3.14 kilometers, furlongs, acres, leagues, or city blocks if you choose, anywhere you choose! Just be sure to wear your Pi K shirt and share your picture on ISC’s social media pages.


Navy blue t-shirt with Pi symbol on the front and the number 3.14 on back above logos for Illinois Science Council and Fleet Feet

ISC’s 2023 Pi K Fun Run T-shirt is a softstyle unisex cotton tee available in sizes XS – 2XL. This year’s collectible tee is in dark navy – a perfect addition to your collection. The logo on the front is not some esoteric equation. Rather, it simply indicates this is a “Pi K” as opposed to a 5K run (a little extra for math), and the exponent number indicates this year, 2023 is our 11th annual run.

The back makes it clear you dig math and how far you ran. The line line between 3.14 and the ISC and FleetFeet logos is not a divider line at all. Up close you’ll note that it’s a long sequence of digits of pi. 🙂

Significance of Pi:

Pi, in case you don’t remember, is abbreviated to 3.14 but continues indefinitely. To date, it has been calculated by computer to over 1.2 trillion digits. Competitions exist for reciting the most digits by memory. As the world’s most famous mathematical constant, Pi is important to many formulas used in mathematics, science, engineering and statistics.

Awesome Sponsors! ISC is thrilled to partner again with Fleet Feet Sports, Chicago’s top running source, for this fun event. If you are interested in partnership opportunities for this, or ISC’s many STEM events, or want to sponsor your company team to run the Pi K, email Monica at PiDay@IllinoisScience.org.

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More Details:

There is no packet pickup prior to the run but post-run, back at Fleet Feet, we’ll have sweet circular treats!

Bag check is available at the stores and you can change clothes there, so please arrive early.

T-shirts will be mailed to you in advance so you can wear it to the run if you register by Thursday, 2/23. If you register between 2/24 – 3/14, your shirt will arrive about 2 weeks after Pi Day.

Weather: This is Chicago. Weather on March 14 could be warm and sunny, or cold, windy and wet. You know how to dress accordingly. Pi K takes place rain, snow, or shine. If cancellation is warranted due to severe weather conditions, announcements will be made on the day of the run, not in advance. Even if the run is cancelled, the post party probably won’t be. We’re not savages!! There are no refunds but transfers are allowed.

WAIVER and RELEASE: Waiver of Responsibility: I know that participating in a running/walking event is a potentially hazardous activity. I should not enter unless I am medically able and properly trained. I agree to abide by a decision of a race official relative to my ability to safely complete the run/walk. I assume all risks associated with running/walking in this event including but not limited to: falls, contact with other participants, the effects of the weather, including low temperature/high heat and/or humidity, traffic, and the conditions of the course, all risk being known and appreciated by me.

Having read this waiver and knowing these facts and in consideration of my entry, I, for myself, and anyone entitled to act on my behalf, waive and release Illinois Science Council and its officers and employees, DL ZIMCO, Inc. d/b/a Fleet Feet Sports-Chicago and its officers and employees, and all other sponsors, individuals, and volunteers associated with the event, their representatives and successors and all claims of liabilities of any kind arising out of my participation in this event. I attest and verify that I am physically fit and have sufficiently trained for the event. No refunds will be provided if race is canceled due to unforeseen circumstances or acts of nature. I realize that pictures taken at the race can be used for marketing materials and I consent that my image may be used. There are no refunds but transfers are allowed. By registering for this event, I agree to this waiver and liability release.