Holidays and holiday weekends are among the most popular for running races, but Charleston has never attached itself to Labor Day for a run until this year.

On Monday, Labor Day is to wed to another unusual partner in Charleston — the 20K. For the metrically-challenged, that’s 12.4 miles, which is shy of the popular half marathon distance by .7 of a mile.

But you don’t have to log a 20K on Monday to participate in the trail run at Laurel Hill Plantation County Park in Mount Pleasant. There’s also a relay and a 5K.

In fact, Jimmy Stephens of Event Timing Solution decided on the 20K with more from the relay perspective after he “borrowed” the idea from one of his assistant coaches at USC Upstate.

“A 20K is a lot of work,” says Stephens, “so Labor Day seemed like a good fit.”

The run will involve four 5K loops at Laurel Hill.

The Labor Day 20K, relay and 5K (run/walk) starts at 8:30 a.m. Monday at the park. Fees are $30 for the 20K, $25 for the 5K and $85 total for the 20K relay.!register/omvbu

Busy weekend beyond

While the schedule for the last holiday weekend of summer is light, the weekend after is jam packed and may require a little planning.

It features four runs, including an inaugural sunset beach run — the South Carolina Aquarium’s Turtle Trek 5K at 6:30 p.m. Sept. 10 Two others, held the morning of Sept. 10, include the fifth annual Travis Manion Foundation 9/11 Heroes Run 5K on Daniel Island and the eighth annual Lowcountry Red Ribbon 5K at Wannamaker County Park.

On Sunday, the Capers Island ECOthon will start with a ferry ride at 9 a.m. Sept. 11.

Cycling events of two very different forms — a short slow roll in the city and long rides in the country — also take place on Sept. 10.

For the first time, RIDEdwin will be not be held in July nor from Cannon Park.

The seventh annual ride, a memorial to the late Edwin Gardner, has not only moved its starting point to Palmetto Brewery on Huger Street but the four-mile ride will roll through the “northern peninsula.” Participants for the free ride are asked to arrive by 11:45 a.m. Sept. 10 with the ride to start at noon.

The 11th annual Tour de Round O (Round O is a unincorporated community in Colleton County) will feature a century (100 miles), a metric century (62 miles) and 40-miler. It starts at 8 a.m. Sept. 10.

On top of all that, the third annual Charleston Water Sportsfest kicks off Sept. 12. The week-long focus on the array of watersport activities in Charleston spotlights several outfitters and events, including the Chucktown Showdown SUP race on Sept. 17.

Beach volleyball sign-up

While the days of summer are waning fast, the warm, beachy weather will last a couple of more months.

Perfect for beach volleyball, even though the Charleston Beach Volleyball and Social Club is actually two miles from the beach.

Fall leagues at Charleston’s busiest beach volleyball venue, courts next to Santi’s Restaurante Mexicano, start Sept. 13-15. The deadline to sign up for the eight-week leagues is Sept. 7. Membership fees are $75 for individuals or $300 per team.

Pickup games are 6-9 p.m. Thursdays, 9:30 a.m. to 12:30 p.m. Saturdays, and 3-8 p.m. Sundays until Oct. 30. Pickup and Open play fee is $7.

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