That sounds so nice, you are very lucky to have a Mommy who is going to throw you an AB Birthday.
Me and my Mommy friend were talking about doing this for me when I have my birthday in July, but sadly, my folks are coming down to visit on my Birthday, so me and Mommy are bound to have to shift our plans around
Considering that I've been planning for the same thing, I have a few ideas.
How about presents? All good babies deserve presents. Maybe you could ask Mommy if she can buy you a toy or two and wrap them up. There's something really pure, child-like and nostalgic behind tearing open a present on your Birthday, it's something I haven't had for years, the last time I had a wrapped present on my birthday was when I was 13.
Picture time was another thing me and my Mommy friend were thinking about. Maybe your Mommy can snap a few pics of your with a disposable camera, catch you in your silly birthday hat, ripping open your presents, blowing out the candles on your cake and that moment when you start to dig in.
Also, it goes without saying, your current birthday list is pretty packed and thorough as it is, but let's not forget the other usual baby behaviours. Maybe Mommy can play with you and your toys on your special day, birthday cuddles would be nice as well and of course, a birthday diaper change.
Hopefully, I've given you some good suggestions. Happy Birthday to you and have fun