I’m so sorry.
We went through the same thing last year. My son (8) has ADHD and socializing is hard for him. We had 1 RSVP. And only 1 kid from class showed up. It broke my heart.
Fingers crossed this doesn’t happen to you.
But instead of letting other’s stress you or your kiddo out, remember it isn’t about who comes. It’s about having fun and celebrating. It was much harder on me than my son, so I took his advice and took a breath and jumped in the bounce house with him.