CHI 2009 conference is in Boston (April 4-9).  Early Registration Deadline: February 18th.  You can register for the full conference or any of the days.

"Computing is reaching into all parts of modern life. CHI 2009 will be the showcase for the technologies, designs and ideas that will form the new world of digital life. There are many exciting new ways in which computing can improve life in many parts of the world. CHI 2009 will be the place to see that happen."

Mahmoud