The Inaugural USA Science & Engineering Festival is looking for participants in its October 23rd & 24th Washington, DC Expo and for additions to its list of satellite festivals being held across the country.

The event is the country’s first national science festival, and the Expo on the National Mall will feature more than 500 US science and engineering organizations, each with a different hands-on science activity. To register for the Expo, or to learn how you can organize a satellite festival at your own organization, visit them online, follow them on Twitter, or join their Facebook group.