Tomorrow night is Yuri's Night, a celebration of the first human spaceflight, made on April 12, 1961 by Russian cosmonaut Yuri Gagarin. His flight took one orbit that lasted 108 minutes in his Vostok 1 spacecraft.
He was the first person to leave the bonds of the Earth's gravity and the first to see the planet as a globe without borders. The celebration of this event has slowly been growing over the years, and hopefully you will join in too. You can find out more and event locations spanning the globe at yurisnight.net, and more on Yuri Gagarin on Wikipedia.
"Circling the Earth in my orbital spaceship I marveled at the beauty of our planet. People of the world, let us safeguard and enhance this beauty — not destroy it!"
Yuri Gagarin, 1st person in space
[Sorry this one is relatively short, messing around with this template and still trying to get back into things.]