This evening is Twelfth Night, the eve of the Epiphany, and the end of the Twelve Days of Christmas. It's long been a time for festivity, the key ingredients (according to the Dictionary of English Folklore) being 'cake and alcohol'. That should be possible even in lockdown...

Wassailing is more important than ever this year: the word comes from an Old English phrase, 'wes hal', 'be in good health', used to wish health to people and (later) trees.

Here's a note on the word's possible history, from the OED.

A lovely piece on Twelfth Night parties in literature: 'the setting for mischief, malice, epiphanies, the taking of power, and life-altering events'... https://www.theguardian.com/books/booksblog/2015/jan/06/twelfth-night-liteary-epiphanies

'Twelfthmas Eve' https://www.patreon.com/posts/twelfthmas-eve-45832156

This is one of the earliest records of wassailing trees, from Fordwich in Kent, c.1577: boys 'beat the trees and sing vain songs' to make them bear better fruit next year. It was being suppressed as superstitious, and might have got you locked up in Fordwich's tiny town hall...

Weird and wonderful winter traditions...