Tufts University invites the community to a screening and discussion of the film "A Reckoning in Boston," a documentary by James Rutenbeck about racial and economic inequalities in cities. In the film, a 65-year-old grandfather and a 44-year-old woman both have different reasons for enrolling in a humanities course at a Boston community center. Five years later, the two have arrived at surprising places in their lives. The film will be screened from noon to 1:30 p.m., followed by a talk…