The “Woodstock for non-belief” is an event sponsored by many of the country’s largest secular organizations. The day-long event will be held on the National Mall and will feature musicians, writers, comedians and actors, including Shelley Segal, Richard Dawkins, Adam Savage, Tim Minchin, high-school activist Jessica Ahlquist, Taslima Nasrin, Paul Provenza, James Randi, the band Bad Religion and Congressman Pete Stark. Kids are welcome. A Camp Quest tent will be open for children aged 5 to 15, with science experiments, craft projects and games.