The March for Science is officially scheduled for April 22, 2017 in Washington DC. Satellite marches are being organized across the country including in Des Moines Iowa.
About the March (from https://www.marchforscience.com/ )
The March for Science is a celebration of our passion for science and a call to support and safeguard the scientific community. Recent policy changes have caused heightened worry among scientists, and the incredible and immediate outpouring of support has made clear that these concerns are also shared by hundreds of thousands of people around the world. Mischaracterization of science as a partisan issue, which has given policymakers permission to reject overwhelming evidence, is a critical and urgent matter. It is time for people who support scientific research and evidence-based policies to take a public stand and be counted.
Main event page: https://www.facebook.com/marchforscience
March for Science Iowa: https://www.facebook.com/marchforscienceiowa/