Work to Ride, the Fairmount Park organization offering horseback riding and polo lessons to city kids, will celebrate the opening of its new arena this weekend with an inaugural competition.

The equestrian group raised $15 million to build the McCausland Arena , which includes a barn, indoor and outdoor competition spaces, pastures, a mezzanine and a tie area. That project was completed in June, and crews will finish work rehabbing the existing stables in the coming days. MORE: 'Task' Episode 3 recap: Sparks fly and moles emerge in the Delco crime drama

The 45,000-square-foot space will allow for year-round programming and expand the number of youths that Work to Ride can support. Kareem Rosser, the executive vice president of Work to Ride, said the organization will also be abl

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