I made a mistake and now I'm panicking

To preface, for my son's birthday last year we invited about 10-12 kids for his birthday party. Most said yes, and we were prepared to have the housed filled with kids. The day comes and ONE friend showed up. It was insanely devastating but he still enjoyed his birthday. This year, I wanted to avoid this, so the guest list was practically doubled (with kids my son wanted there). In comes the flood of rsvps. There's still a chance some people will drop but I still expected some nos. I got one ONE no. I'm freaking out as I imagined this party to be 25+ people. But with the sheer amount of rsvps and no one backing out yet, this party is easily knocking on 60+ (kids with parents + family). I booked a gymnasium which is part of the reason why I invited so many.

I overdid it with the invites and I'm deeply regretting it. I just needed to vent. The party is next Saturday and then my daughter's party is 3 weeks later. Eek! (Son will be 6, daughter will be 4).