Donald Trump’s visit to Aurora on Friday for a sold-out rally will mark the first big public event by a major-party presidential candidate in Colorado this year — with Trump’s visit motivated more by the chance to amplify his rhetoric about migrants than to seize on any likely prospect of winning Colorado. His planned afternoon stop on the northern edge of Aurora, near the airport, comes three weeks after the former president and current Republican nominee pledged to visit a suburban city he’s falsely claimed has been overrun by Venezuelan gangs.