AIBU about rsvping for party?

[jemimapta]

First time throwing party for whole class for my child in reception class, is it normal for people to be rsvping the day before the party? and telling (not asking) that they will be bringing siblings?

At our most recent party, I had "Can X still come?" 4 hours before. (I replied that I could jiggle the adult places around as the venue was now full.) Several people dithered around were they coming or not and changed their minds. A couple didn't reply and couldn't be chased up... I'd normally take that as a "no" but last year someone did randomly show up.

No surprises that these are all people who have not held a single party between them in the last 4 years. That's me done with "all the boys" for that class. DS is one of the older ones in the year so the trend of parties for the year isn't clear by the time I need to plan his.

Siblings. When in a public venue such as soft play, I've just paid for sibling to be in the same place at the same time. Sometimes I've had to ask when they were younger and DH wasn't avaliable. Less of an issue now dropping and running is more viable for either.

I had about 7 who didn't respond at all, about 3 who responded after RSVP date and one ask to bring a sibling....5 people just bought a sibling, sat then down for food and expected a party bag for them and one show up who hadnt rsvp'd. It is annoying because I changed from a soft play to a sports centre as DS wanted whole class....least with a decent soft play you only pay for those who you write on the list and don't need to cater unnecessarily

@Dreamingofkfc
Had a soft play party for DS1 and agreed beforehand that we would pay for play for 3 younger siblings of friends (no food).
OH goes to settle up after party and we were charged for 7 extra. Some cheeky fucks had brought siblings without checking beforehand and just added them onto our tab.

I am absolutely gobsmacked at the rudeness of some people! I have a few years before I have to worry about my children's parties but it seems like I have a lot to learn too! Crikey, the cheek on some people never ceases to amaze me.