On June 20, the Democratic National Committee formally decided to choose its presidential and vice-presidential nominees with a virtual roll-call, in advance of the national convention. The committee still hasn’t announced the date of the virtual roll-call, but it will be later than July 21, because the credentials committee meets that day.
See this story, which erroneously claims that Ohio law requires the nomination to be made before the actual convention. Ohio changed its law on June 2.