This year, for the fourth summer, employees in the school district’s technology department will organize seven or eight Food Truck Thursdays, for which they schedule one mobile food vendor each week. (One Mt. Lebanon restaurant that set up there, Arancini House on Washington Road, aspires to get an actual truck at some point.) They even set up tables and chairs, with tents for shade (and if the weather’s really bad, diners can move indoors to the Fine Arts lobby). They play music. The public is welcome.