Some companies have reported that they are not having an office party this year, but...

... Christmas has not been totally cancelled this year in some offices. Companies have found alternatives to make the famous end of year party 

It has been found that what has replaced a uniform pattern of drinks parties followed by more drinks is much more diverse

We will know and learn different ways to celebrate : companies that choose everything from Zoom parties with special celebrity appearances and virtual Christmas carol services led by Robbie Williams, to virtual wine tasting and bakery sessions with cocktails delivered to employees' homes and the abandonment of any group activity in favor of signatures for mental health support applications.
There is also a company that has planned a team trip next summer in place of the traditional Christmas party.