I know its got something to do with the coming of age in Jewish tradition ... but hold on ... let me look it up in the dictionary for you ...
Also spelled, bar miz'vah ... meaning, [Lit.] son of command. 1. A boy who has completed his thirteenth year, the age of responsibility and religious duty. 2. The ceremony of recognizing one as such a person."
Thus, essentially a "Ceremony" where the boy is Congratulated, and as things go in ceremonies, people attending the Ceremony, being served Unleavened Bread and Kosher food ... but I am not sure about these two food items ... so you will have to look up these and other details, in Wikipedia.
By the way, who reads the newspaper for you at home ?