But do not fear.
Your ever loyal and wonderfully organised Grover has prepared for this by scheduling this bloglet and by making a video message for you. If everything goes according to plan you will be able to watch this video by clicking here. (The video has annotations which won't be visible on a phone, so please watch on a computer!)
If things are not going to plan, you won't ... but I hope you have a fantastic day, get lots of presents and eat lots of cake.
Happy birthday, lovely!