Like most big events in Japan these days, The Sapporo Snow Festival had been canceled for 2021 (except indoor exhibitions, go figure). Yet some of the activities are moving online.
At the site for Online Sapporo Snow Festival 2021, you would find a slew of events happening, like Snow Fest photo competition. You can post your Snow Festival photos on Instagram and enter the contest (deadline to enter is next Friday, Feb 12th).
There will be a virtual bus tour, with live streaming on YouTube and Nico Nico, the Japan YouTube equivalent. The live stream will start by 12 pm local time on Feb 6th (3 am London time, 10 pm EST on Feb 5th).
In coordination with the Online Festival, a lot of travel destinations in the Sapporo area will have their own events as well (https://online.snowfes.com/collabolation/, in Japanese). Of course, why would they want to not hold a major event to avoid spreading COVID, and replace it with smaller events all over the place? I have no idea.