The LigerBots, Newton’s dual-high-school robotics team, has completed its six-week design-and-build season to create Chronos, the robot it will use in FIRST Power Up competitions. (See video introduction of Chronos here.) You can see Chronos and the LigerBots in action at the North Shore District Event, March 16-18 at Reading Memorial HS (62 Oakland Rd., Reading) or the Greater Boston District Event on April 6-8 at Revere HS (101 School St., Revere). Most of the action for public viewing will be on the last day of each event.