<p>Hey does anybody know when christmas holidays start? </p>
<p>I want to book my flight ticket asap, so it would be really helpful to know. thx</p>
<p>[Academic</a> Calendar Fall 2007 through Summer 2010](<a href=“http://www.upenn.edu/almanac/3yearcal.html]Academic”>http://www.upenn.edu/almanac/3yearcal.html)</p>