Birthday party tomorrow - how to cater to child with nut & dairy allergy?

[Sarahjsxx]

Hello,
Hoping for any advice, my sons 5th bday party tomorrow, one of the children has a nut & dairy allergy, I'm not sure what to do about food for him, I am doing a buffet type food but was wondering should I make a small lunchbox for him? (But would that make it awkward I'm not sure)
I am doing cheese sandwiches, pepperoni & cheese/tomato pizzas, popcorn chicken, crisps popcorn, fruit & vegetable platters, biscuits etc, how can I choose soemthing suitable for him/everyone?
Thanks for any advice!

Thanks all for the replies, I messaged his mum just after posting this and she said she will bring a packed lunch for him to the party so that is sorted x
In terms of party bags and cake I am putting free from chocolate in his bag and will try find a cakes thanks for the idea

I'm glad she's bringing food. Even as a parent of a child with allergies it can be such a headache.