This has been my fear which is why I always choose to have vacation birthdays, family birthdays, or birthdays where I invite my friends with kids. I don’t like to invite his classroom of friends because I’m terrified he will be let down. Whether or not that’s the right thing to do or not, I just haven’t had the courage yet to do that. I have actually gone to every kids birthday party that I’ve been invited to because I’m worried that no one else will go (which usually there are 10+ kids). I hate going to kids birthday parties but birthday parties are such a big deal to kiddos that it’s important for us parents to show up if we can. So sorry this happened to you, I know the heartbreak.