What’s up this weekend? A lot! Check it out:

* Track stars at Wild Basin Fitness: Trey Hardee, University of Texas graduate and reigning world gold medal champion in decathlon, and Chelsea Johnson, silver medalist in pole vault, will make an appearance from 8-10 a.m. Friday, Oct. 2, at Wild Basin Fitness, 300 Beardsley Lane, Building B, Suite 101, from 8-10 a.m. Friday, Oct. 2. The athletes will demonstrate 10 different exercises and then invite participants to try. For more information call (512) 306-7376.

* Donkey Dash 5K and Doggy Dash: Run with your canine training partner at the inaugural Sunset Valley Donkey Dash 5k and Doggy Dash. The race kicks off at 8 a.m. Sunday, Oct. 4 at Doc’s Backyard, 5207 Brodie Lane. All aid stations will have water bowls and dog treats; owners must carry a “doggy disposal bag.” A post-race doggy party will include dog ice cream and other treats compliments of Banfield and Petsmart. For the adults? Free beer! Registration is $20 for individuals and $5 for canines; $30 and $10 after Sept. 30. Race proceeds benefit the Sunset Valley Elementary School. To volunteer, contact race director Andrea Fisher at ironmanfishy@hotmail.com. For more information go here.

* Parkinson’s 5K: The Pick Up Your Feet for Parkinson’s 5K Run/Walk kicks off at 8 a.m. Sunday, Oct. 4 at Williamson County Regional Park, 3005 CR 175 in Leander. The race honors long-time runner and Sun City resident John Carchedi, who has Parkinson’s. Registration is $25 ($10 per additional family member). A portion of proceeds will benefit the Michael J. Fox Foundation for Parkinson’s Research. To register go here.

And more on the horizon:

* Lake Travis Relay: The “Best Dam Open Water Swim Around” gets under way at 9 a.m. Saturday, Oct. 10 at Mansfield Dam Park on Lake Travis. The six-person relay finishes at The Pier on Lake Travis. Each person swims a 20-minute leg, then a 15-minute leg, then 10-minute legs until their team has completed the 12-mile course. Entry is $60 per swimmer ($20 for alternates) by Oct. 1; fees increase by $10 after Oct. 1. Swimmers may race solo for $110. Race is on drought or no drought. For information, call 512-327-2260 or go here.

* Texas Mamma Jamma Ride: Chose from 10, 25, 45, 65 or 100-mile routes in this inaugural ride against breast cancer, which starts at 8:30 a.m. Saturday, Oct. 10 at Reunion Ranch, 850 County Road 255 in Georgetown. The ride aims to raise $400,000 for 10 local non-profit organizations that provide services to Central Texans with breast cancer. Routes go through Williamson County and the towns of Liberty Hill and Bertram. All routes are fully supported. For more information, go here or call 512-371-7433.

* Austin Oyster Urban Adventure Race: Teams run, bike, paddle, climb and perform other crazy athletic stunts as they race 30 to 40 miles around the city in a combination triathlon/scavenger hunt. Start time is 8 a.m. Sunday, Oct. 11 at RunTex, 422 W. Riverside Dr. Registration is $75 per person for the full race; $65 per person for the half. Each team also must raise $100 in donations, which benefit the Austin Parks Foundation. For more information go here.

* Run Austin Run Half Marathon, 5K and 10K: The Run Austin Run events kick off at 7 a.m. Sunday, Oct. 11 at The Triangle, 45th and Guadalupe Streets. Registration is $70 for the half marathon, $40 for the 10K and $30 for the 5K. Online registration closes Oct. 9. A portion of proceeds benefits the Capital Area Food Bank. Packet pickup is 10 a.m. to 5 p.m. Saturday, Oct. 10 at The Triangle Park, 4700 N. Lamar Blvd. For more information, go here.