LOS ANGELES, 2016-May-13 — /EPR Retail News/ — Need a job? Ralphs Grocery Company is hiring 400 people to fill open positions in its Southern California supermarkets. All Ralphs supermarkets will be holding hiring events on Saturday, May 14 from 10 a.m. to 3 p.m. "We have a wide variety of part-time positions that we need to fill…