This event was started by NASA and a few other partners three years ago (I believe), with just a few events. Last year, there were 502 events in 53 countries, and they're hoping for more this year!
Take a look at the website to see if there is an event in your area. Also, if you're an artistic type, they are having an art contest! There are 10 categories, from poetry to graphic novels, and everything in between. They will be taking entries until November 5th.
We will be hosting an event at the local observatory - should be a fun one (and it also means the end to a very long and busy week for myself, so YAY!).