More 🙄 than thrilled. My immed thought would probably be "HUH?!"🤨
Sure, it's a nice gesture but I would prefer to be kept informed earlier out of respect. After all it will involve my own time and schedule, and I might have prior engagements.
I'd also want to discuss and approve the guestlist and food, be part of the decision process. For MY kid's sake.
Lastly, it'd better not be on my kid's actual birthday date. 🙅🏻♀️