--(BUSINESS WIRE)--Gartner, Inc. (NYSE:IT): What: Gartner Digital Marketing Conference 2015 When: May 5-7, 2015 Where: Manchester Grand Hyatt San Diego, CA. Details: A recent Gartner survey revealed that Digital Marketing budgets will increase by eight percent in 2015 and much of that investment will be focused on enhancing the customer experience. The inaugural Gartner Digital Marketing Conference will provide senior marketing leaders with unbiased, unrivaled perspectives and advice on digital