The latest in electric vehicle technology -- including cars, motorcycles, bicycles and charging systems -- will be showcased in the west parking lot of the University of Colorado Boulder’s Wolf Law Building from 11 a.m. to 2 p.m. on May 17. A screening of the documentary “Revenge of the Electric Vehicle” with a question-and-answer session will be held later that day from 6:30 to 8:30 p.m. in room 1B20 of the Ƶ-Boulder Visual Arts Complex. Both events, including refreshments and door prizes donated by local sponsors, are free and open to the public.