Similar to a baseball league, see if your local team will take on a "Playspace Challenge" where the number of points scored in a game equals donations to your project, etc.
Athletes love to work as teams, on or off the field. Encourage them to volunteer together for Build Day.
How about a kickball demonstration at lunchtime on Build Day? This might help volunteers reminisce about their play experiences. Who knows? Maybe they'll sign up to join the team!
A donation of old sports equipment could enhance your playspace programming.
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