My dad LOVED the Holidays. As an only child, he made them a huge deal and was like an absolute kid this time of year. His Xmas Eve feasts are legendary.
In fact, I know he held on through the Holidays- passing away the end of January because he didn't want the Holidays to be 'forever ruined/a source of pain'. Seriously.
It's tough. I try to channel all the fun and work on instilling that spirit in my kids. My 13 and 16 year old boys are already talking about all the things they love about this time of year and what we will do. They love all of the traditions. That makes my heart grow big to carry on his spirit. But, I do have my moments and go cry by myself and then buck up and go on.
I take the time to do a few things I know he would love. It's been 3 years.
My siblings and I have come back for every single holiday just like you OP. Not because it was expected, but because it was so much fun. My siblings and I still get together. My mom has chosen to take over on Xmas Eve 'for as long as she can

".
The Holidays are hard for so many people. It's why we should all be kind and look out for one another.
I wish you the best and hope the memories warm your heart. They are with you in spirit.