As reported by engadget,
It’s not shocking that Epic would keep its physical tourney calendar empty. While COVID-19 vaccines are on the way, the mass immunizations needed to hold safe in-person events could take several months or more. It’s also possible that social distancing and capacity limits will stay in place for a while after vaccines are widely available. It’s simply easier for Epic to rule out in-person Fortnite matches than to gamble on conditions improving quickly.
Other game tournaments, such as Dota 2’s The International, are still considered possibilities in 2021. With that said, don’t be surprised if they follow Epic’s path by either cancelling 2021 events outright or setting strict limits on who can attend.