Well, having two kids of my own, I was not always thrilled with the lack of RSVP.
However, I did have parents who were diligent about it, asked for gift suggestions, etc. Many of the rest would just show up or not.
I always did handmade invitations and followed up with a phone call. If someone couldn't make it, fine. But......and this is a BIG but, if we invited 10 kids, we had enough for 10 kids. We certainly had kids show up that we weren't sure about and we had kids NOT show up that we thought would be there.
You make it a fun party regardless. If there's leftover pizza and cake, we always divied it up. If kids had younger siblings who didn't come, we sent an extra bag home for them.
We just never invited more than we could budget for and we proceeded as if all the kids would come. My daughter had one little friend who very early on said she'd be there, but she got sick. Her dad brought the present to the party. We sent her with a piece of cake and a goody bag and an extra special thank you for not just blowing the whole thing off. It was very thoughtful of them to follow through the best they could.
E-vites in theory would be great if people actually saw them.
My aunt sent me a picture of my cousin's new baby and it went to spam.
These things happen.
Little kids also forget to give their parents invitations until the last minute.
There's not really a perfect way that I've found to have everthing go off without a hitch so you just plan like everyone will come and go from there.
I know that my kids most successful parties were held at bowling allies. We supplied the pizza, the cake, the shoe rental, etc. We always had a full house for that.
One thing I do want to say is that Summer birthday parties can be tough.
My son was born in late June. Everyone scatters to the winds for vacations, etc at that time.
We started having his birthday parties before school let out so that his friends could all be there.
I'm a December baby. So is my sister.
We were either gone out of town visiting our relatives on Christmas vacation or our friends were doing the same thing. It was terrible trying to have a birthday party with all the other holiday hub-bub.
In your case, summer is winding down. School starts here on the 24th. People are out of town, they are shopping for school clothes and last minute supplies.
You might have to get creative with the timing of your parties. Definitely have this one and see how it goes, but be open to the idea of doing something special on her actual birthday and having the party at a time, either before or after, that is easier for people to attend.
My son grew very accustomed and was happy having his party 2 to 3 weeks early because that's when all his friends could come.
My sister and I actually had our parties in June when no one was worried about the Holidays.
Like I said, it helps to get creative in the planning and then keep things to a manageable number assuming everyone will come.
You'll get it figured out as you go along.
Very best wishes and I hope you all have a great time!