Prepare for brain freeze, as 7-Eleven stores throughout Canada, including Castlegar, are giving out free slurpees today (July 11). Free Slurpee Day is is a thank you to customers for 43 loyal years of Slurpee drinking, 7-Eleven is expecting to serve up nearly half a million of the 7.11 oz. cups for free at all its stores across the country between 11:00am and 7:00pm (or until stocks last).