DS is turning 4 and we are planning a birthday party. Of the parties DS has been to, the vast majority have been the entire preschool class invited (generally soft play but there have been some with a hall rented).
DS has explicitly requested a birthday party with his friends. But we know a lot of children outside of preschool (through friends and sport) who DS plays with more than some of the ones at preschool. Would it be so horrible not to invite everybody? The activity DS would like to do limits to 25 children, and with all preschool children included, we are at 35+.
I'm not from the UK and don't want to do a social faux pas, but not sure what the etiquette here is.