Question London Christmas Ideas Needed!

We had to change our Christmas plans from Biltmore Estate to London, and we're really excited! We'll be staying at The Langham Hotel with two other couples. Since I’m a big fan of A Christmas Carol, I’m looking for themed events, plays, or special tours happening during this festive season. Are there any must-see attractions or unique experiences that you would recommend to make our Christmas trip memorable? Any tips on enjoying London during the holidays would be greatly appreciated!