Write Out 2021 is a combined effort of the National Writing Project and the National Parks Service. The theme of the project, beyond inspiration from the outdoors, is "palettes, storyboards, and cadences." I encourage you to read Kevin's blog post about Write Out to get some ideas about how the theme can be used by student writers.
If you want your students to participate in Write Out 2021 head to the website and sign-up to receive writing prompts, activities, and events to support work in the classroom.