“It’s a risk you have to take,” said Morton Blackwell, 80, an R.N.C. member from Virginia who has attended every party convention since he was the youngest elected delegate backing Barry Goldwater in 1964. “You take risks every day. You drive down the street and a cement truck could crash into you. You can’t not do what you have to do because of some possibility of a bad result.”

Art Wittich, 62, an R.N.C. member from Montana, said he had a “duty” to travel to Charlotte and Jacksonville to nominate and support Mr. Trump.

“It is not only my duty, but also my honor go to Charlotte and Jacksonville to re-elect President Trump,” he said. “As such, I am willing to assume any risk to do so.”…

“If I can safely go to Walmart or a restaurant, I am confident we can safely gather to conduct the important business of the Republican Party renominating the president and vice president,” said Henry Barbour, an R.N.C. member from Mississippi. “We were prepared to work with folks in North Carolina to make it safe, and that is exactly what the R.N.C. is doing in Jacksonville.”