By STEVE PEOPLES and TOM FOREMAN Jr. CHARLOTTE, N.C. — As Charlotte, North Carolina, celebrates being chosen Friday to host the 2020 Republican National Convention, an undercurrent of concern about the potential for violence runs through the Democratic-leaning city. The GOP’s national committee selected North Carolina’s largest city over Las Vegas as hundreds of party activists gathered in Austin, Texas, for the committee’s summer meeting. “The city that I represent has truly established its place on the national stage, and I want to thank you again for the opportunity to showcase our city and showing the world how special we are,” said Mayor Vi Lyles, Charlotte’s first black female mayor.