Missouri Headwaters State Park will host a free presentation featuring guest-speakers Marisa Diaz-Waian and John Clayton on Saturday, July 3, at 7 p.m. in the park’s campground. Bring your own lawn chair. A marshmallow roast follows each program, weather permitting.

Marisa Diaz-Waian and John Clayton will co-lead a discussion about the unique lives of John Muir and Gifford Pinchot, including the questions their contrasting philosophies raise about “the wild” and our place in it. Preservation-based philosophies associated with Muir celebrate the spiritual benefits of holistic, unimpair...