This weekend, Feb. 15-17 (Friday, Saturday, Sunday) at the Cox Convention Center

The Bart and Nadia Sports & Health Festival (http://bartandnadiafestival.com)
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From Oklahoma's most famous sports couple
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Lots of events: gymnastics competitions, rowing, archery, powerlifting, and...

a 5K (two lap) family run in the OKC Underground
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Admission is free.
$1 parking available at the Cox Convention Center

More here:
Cox Convention Center :: The 2013 Bart & Nadia Sports & Health Festival (http://www.coxconventioncenter.com/default.asp?cox=25&objId=797)

Slight clarification...

While the entire event occurs over the whole weekend (including gymnastics tournaments), the actual festival events open to the public apparently are all on Saturday (Feb. 16) from 9am to 5pm.

We are so lucky that Bart and Nadia have continued to make Oklahoma their home. Neither are natives and could easily be successful anywhere in the world.