I was curious to know the answer myself and found the answer at RushtheCourt.net. The article is from 2007 but still applies: “Unless you notice because your team happens to take advantage of the rule in a given summer, one of the open secrets among college hoops fans is that many teams are allowed to get a jumpstart on their season by implementing NCAA Bylaw 30.7 – “Foreign Tours and Competition.” This rule permits teams to take a basketball-related road trip to a non-US territory (yes, even Canada) once every four years, and allows for ten days of practice and as many as ten games against international teams so long as no class time is missed.”
Walter Cornett, of Glendale, Kentucky, is the owner and operator of Walter’s Wildcat World. He founded WildcatWorld.com in 1998 making it one of the oldest Kentucky basketball fan sites in operation today.