Daycare birthdays

Kind of a vent, but I need to see if this is a normal thing or just my kids school.

Last year my kids' birthday was on a weekend and we had a party at a local park. I handed out invitations to their entire 3 year old class at daycare, thinking that we may get one or two RSVPs since the park is right in town where the daycare was. I didn't get a single response either way from any parents, but no biggie.

This year, they're at a new daycare. I did the same thing this time (weekend birthday party, this time at our home) and so far have only gotten one RSVP No. Again, no biggie, I know weekends are hectic for working parents. That's not even the part I'm stressed over tbh.

In the last couple months, three separate kids in their class have had big birthday celebrations at school. I'm talking special lunch, cupcakes and bounce houses set up outside. I have no idea the logistics of this--if the parents are coming in to facilitate everything or relying on the daycare staff. I planned on sending cupcakes or something for my kids on the actual day of their birthday, but now I'm wondering if at-school-birthday-parties are the standard. I almost feel like I should have just saved my time and energy planning a party on our precious few days off.