Watch it live on television or cable. Listen to it on the radio. Watch it online. Get together with friends and watch it. Tell others to watch it... and tomorrow, talk with others about it.
Just don't make the mistake of not watching any of the debates. They're important. The election is important. Get involved.
And if you're not registered yet, register now. There are only a few days left to do so in most states! (See the State Registration Deadlines for more details.) Do it today.