Penguincon 6.0 happens April 18-20, 2008 in Troy Michigan.
For folks in the great Northwest of United States, there's LinuxFest Northwest 2008 taking place on April 26 & April 27 in Bellingham, Washington.
LinuxDays 2008 takes place in Luxembourg from Tuesday, February 19th to Wednesday, February 20th, 2008.
The Southern California Linux Expo is being held Friday, Saturday, and Sunday (February 8th to 10th, 2008) at the Westin Los Angeles Airport.
Down under in Australia, you can check out linux.conf.au running from Wednesday, January 30th to Saturday, February 2nd, 2008.
Visit any of the sites and get on their mailing lists for updates and notices. LinuxFests are a great way to meet other Linux users, sample the latest in Linux technology and, if you're a beginner, get a helping hand.