DD is in reception and we are starting to think about her 5th birthday party. For her 3rd we went with her nursery buddies to a soft play centre. We didn't do a 4th because too complicated as mixing nursery with pre-school.
For her 5th we have 3 options:
a) Invite her class (18)
b) Invite her year (36) which includes lots of her friends from last year
c) Invite just the girls from year (12)
We inclined not to go with c) because this is how we expect things to develop in later years.
Obviously a) suits us with numbers but b) means that she gets to be with all her friends - they mix together for sport and breaks.
Of course we could try and select "best friends" but this is so invidious and we don't know who she really mixes with.
What is the normal form? Once we've got our head around numbers then we can start considering options.