If unlimited pizza is your idea of a dream come true, then City Hall Plaza on July 7 & 8 is your nirvana. That’s where the second annual Boston Pizza Festival takes place from noon–8 p.m., featuring slices in a half dozen styles from both local and international pie-makers. Enthusiastic pizza-lovers can also access beer and wine vendors, as well as enjoy live music and games. And as a bonus? It all benefits Action for Boston Community Development, a nonprofit organization dedicated to helping economically disadvantaged residents of the Greater Boston area get the resources they need to achieve stability and success.