Microsoft, with their BUILD conference a couple years ago, actually had the best implementation of a COVID-era virtual "conference" that I've seen-- lots of actual live content (and live chat interaction), and to some extent some of the content was actually superior to a real-world conference because the online format (taking questions via chat) makes Q&A more feasible than it would be in person.
I’m not at Microsoft anymore (tho I might still do some stuff for Build this year, since I’m at GitHub), but being part of the team that got Build 2020 across the finish line is one of the things I’m most proud of. Microsoft was the first to do a tech conference in the pandemic (Google canceled, Facebook might have too), so we really didn’t have anything to base it off of.
Apple, naturally, just knocked it out of the park with the production values, but I’ll always love the scrappy nature of Build 2020.