A post to the BlizzCon Website has Blizzard's announcement it will not to hold a BlizzCon this year. In outlining the pros and cons of an in-person show, the post notes that the guidelines for gatherings in California and elsewhere remain moving targets. Here's part discussing the complexities of coordinating a show like BlizzCon and plans for a global event in early 2022 that will combine a smaller in-person gathering and a global online event:

Building an in-person BlizzCon is an epic and complex affair that takes many months of preparation—not just for us, but also for the many talented production partners, esports pros, hosts, entertainers, artists, and other collaborators we team up with locally and globally to put all of the pieces together. The ongoing complexities and uncertainties of the pandemic have impacted our ability to properly move forward on many of these fronts, and ultimately we’re now past the point where we’d be able to develop the kind of event we’d want to create for you in November.

But we don’t want to let too long go by before we connect with everyone again. So in the meantime, we’re planning a global event for the early part of next year, combining an online show along the lines of our recent BlizzConline with smaller in-person gatherings, and we’ll share more as our plans come together.