I don't think you need to feel bad about this, WM...This year has been so different and our thoughts are elsewhere..It's difficult to keep track of the date anyway when days just pass in a similar fashion.
I hope your day is full of happy memories of your Dad, Scass xx My Dad would have been 99 on April 19th..He would have had much to reminisce about on VE Day but I doubt whether he would have been too impressed by the CV pandemic!