That’s right- tonight, February 20th, the moon will be completely blocked out by the Earth’s shadow. It will be visible across North and South America, Western Europe, and Western Africa at around the same time, but you should be able to catch it at its peak between 10:00 pm and 10:51 pm. You can see the partial phases 1 hour and 20 minutes before and after these times, during which time you can see it going all kinds of crazy colors.
There won’t be another lunar eclipse until 2010, so if you plan on seeing a celestial event like this in your fickle youth you should go outside at this time and look up. Bring binoculars/a telescope/a really good camera if you got em.