Celebrate human spaceflight at Yuri’s Night this Saturday (April 10) with Planetary Society CEO Bill Nye (aka the Science Guy), former NASA astronaut and NFL player Leland Melvin, Virgin Galactic founder Sir Richard Branson, the band OK Go, Inspiration4 astronaut Sian Proctor among other special space guests.

Monday, April 12 marks two major space anniversaries: 60 years since the Soviet cosmonaut Yuri Gagarin became the first human in space (April 12, 1961) and 40 years since the first space shuttle flight (April 12, 1981).