To enter the contest, all you need to do is Follow BlackBerry on Twitter and tweet "what you are most excited about for BlackBerry 10, and include the hashtag #BlackBerry10TO". Winners will be notified via a Twitter direct message between between January 23, 2013 and January 28, 2013. Only those living in Canada (excluding Quebec) and the U.S. are eligible to enter the contest. You also have to pay for your own transportation to the party. The complete rules and restrictions can be found at the sourcelink. Good Luck!
source: BlackBerry via MobileSyrup