National walkability expert Dan Burden will be in Des Moines on July 30 and 31 on behalf of the Greater Des Moines Age Friendly Cities project being led by AARP, as well as Healthy Polk 2020 and the city of Des Moines. Burden is the co-founder of the Walkable and Livable Communities Institute in Port Townsend, Wash. On July 30, he will present on tips for transforming a neighborhood into a healthier and more livable place. The presentation will take place from 5:30 to 6:30 p.m. at Amos Hiatt Middle School, 1214 E. 15th St. The program is free; to register, click here. On July 31, Burden will lead a small group walking audit of the Martin Luther King Jr. Park neighborhood from 8:30 a.m. to 3 p.m. For more information, contact Claire Richmond at crichmond@aarp.org.