combination of the words "snack" and "activity." Snacktivity is the action of snacking as an activity. It can involve any foods which one considers a snack. Also, it can be a combination of snacks that can perhaps form a well balanced lunch, or brunch.
"Don't forget to bring some baby carrots for snacktivity!" or "yes its time for snacktivity!"
A gathering of people centered on a fun-to-eat food, such as lobster, fondue, and, to a lesser extent, oreo cookies and string cheese, where the time, physical rigors, and mental exertion required to actually eat the food negates much of the caloric load.
Lobster is my favorite snacktivity.