The specific time Character meets in the resort lobby have only been going on for a few months (maybe since the beginning of the year). They definitely weren't happening (outside the random surprise ones) when we were there last June or any other year we've been there. I've read on other message boards and blogs that these existing scheduled meets at resorts are what Disney is referring to in the Cool Kids Summer promo, they just simply started earlier than the actual promotion (probably a test run).