The coronavirus outbreak has wrought enormous changes to American life over the past several months, and politics have been no exception. Presumptive Democratic nominee Joe Biden has basically been nowhere but his basement, hosting public teleconferences and podcasts that have garnered virtually no public interest. Meanwhile, President Trump has had to suspend his usual practice of hosting raucous public rallies, although his big return to the stage was set for June 20 in Tulsa, Oklahoma. But rallies are one thing; four-day nominating conventions — loud, indoor extravaganzas for the better part of a week — are quite another. Right now, the Republicans look set to push forward. Originally planned to be held in late August in Charlotte, North Carolina, the GOP moved its public nomination of Trump to Jacksonville, Florida, after Roy Cooper, the Democratic governor of the Tarheel State, told the party it could not have the mass gathering it anticipated. And what kind of convention matters greatly to Trump. The point, this year, is not the nomination itself (obviously a formality) but the message the party sends. Trump will aim to run on the idea that America has turned the corner on the coronavirus and is up off the mat. The optics will need to portray a post-fear atmosphere: celebratory, hopeful, renewed. Meanwhile, the prospect of a Democratic convention remains murky at best. Scheduled for mid-August in Milwaukee, the Democrats still look to...