Soupy ...
DS has two friends who are allergic to nuts (both needing epipens; one allergic to peanuts, the other allergic to treenuts, which is bad but not AS bad as peanuts ...)
Both friends came to DS' party in November without their parents .... and I was terrified!
This is what I did:
Totally homemade cake with NO NO NO chocolate in it (either in icing or in cake or in decorations) ... chocolate is notorious for having 'traces of nuts' and better safe than sorry.
I checked with both mums the night before to run through the ingredients of cake and decorations of cake AND the menu for the party tea.
I already knew (from past chats with one of the mums) that there is one brand of crisps that is safe and no traces of nuts ... but this won't help you as it is an NZ brand .... it would be a good idea to check with the mums which crisps are safely made in nut free premises ... they should know. Anyway, I bought all types of crisps of this brand and kept away from other brands.
I decided to keep the menu simple and I ordered in take away pizza (checking first with mums if this was ok ... it was ... but may not be in the UK ...) crisps, marmite sandwiches, some sweets (boiled individually wrapped type ones are best, again check with mums as they will know which brands are safe ... )
For prizes and treats (for pass the parcel etc) I did give out chocolates but made sure the only chocolates given out were the type that were individually wrapped ... For the boys with the allergies I gave them chuppa chup lollipops which they were more than happy with.
I found the best way was to ring the mums, find out what their sons could and couldn't eat and then work out the menu around that in order to stay safe.
They really really appreciated the care that I took because they have both had bad experiences at parties: reactions, people not thinking, not eating because they weren't sure etc. One mum was delighted because it was the first time her son had been able to eat birthday cake at a birthday party that wasn't his own.
HTH g xx