Inspired by memories of fantastic family birthday parties, mother-and-daughter team Nikki Tate and Dani Tate-Stratton researched the history of birthdays in order to answer such questions as, How much does where you grow up influence the way you celebrate getting a year older? Have people always celebrated birthdays? The more they investigated, the more they realized that there's a lot more to birthdays than cake, presents, a few games and perhaps a goody bag. They discovered there are as many ways to observe birthdays as there are places in which to do it.
The first flash mob Ian puts together himself is a sixty-plus person, four-minute pillow fight in a department store. His friend Oswald is thrilled with the event, but Julia, the one Ian really wants to impress, is still convinced that flash mobs are stupid. While Ian tries to prove Julia wrong by initiating flash mobs with political impact, Julia is busy waging war with the strict new principal at school. When Julia goes too far and gets herself suspended, Ian sees an opportunity for a relevant and persuasive flash mob.