Tim, it's a terrible feeling to have someone so close pass. I get where you are coming from. My dad is more out going now than he ever has been. We have become much closer. I often fear having to go through what you have just experienced. I feel for you and hope, with time, your sorrow is more bearable. I like that you intend to celebrate and honor his birthday. Tell story's of him and things he did. Make each other laugh if you can with them. It will hurt miserably, but some how makes things a little better.
It's after midnight now, so Happy birthday to him. And a toast to him as well.