The annual UK RSPB garden bird count is any hour in the last weekend of January. I have been doing this for years. You just choose a spot and count the maximum number of each species seen in the hour. It can be surprising. When done, I submit results to the RSPB online. It is always a great pleasure and you do not need to be an expert birder to do this. Each year, the RSPB get a great deal of data. Some years I see very little. Some years I have seen up to 11 different species.
times you will see quite common birds, but occasionally you may see
something unusual. It is the number of the ordinary birds seen that
tells the real story. If you can, grab a coffee and sit down, look out
the window, and count the birds in your garden or park. I am sure, like me, you will enjoy it.
See https://ww2.rspb.org.uk/discoverandenjoynature/discoverandlearn/birdwatch .