Theis Park and The Nelson-Atkins Museum of Art Donald J. Hall Sculpture Park, Between Oak and Rockhill on Emanuel Cleaver II Blvd. (Cleaver II Blvd. will be closed  from 2-9 p.m.; details below) Celebrate National Parks and Recreation Month at KC’s biggest lawn party! This fun-filled evening of live music, food trucks, art activities and lawn games stretches from the Nelson-Atkins Museum of Art to Brush Creek. Enjoy art activities, live music, and games throughout the Lawn Party. Pack your…