U.S. citizens are not required to have a passport to travel to Canada,
however it does speed things up when going through Customs. The Canada
Customs and Revenue Agency has a great site with recent updates on
documentation required to travel to Canada.

http://www.ccra-adrc.gc.ca/customs/individuals/international/

Conference attendees from countries other than the U.S. can also link to
this site to find out their specific travel requirements.

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