Cooking party tips?

Ok so this isn’t a boring, baby, cooking party. Everybody is going to have a partner. Each pair will get a different secret ingredient and they will make whatever they want with that secret ingredient they recieve. And that pair with present it to the other pairs and the parents. And they will present how to do it. Sort of like a cooking show but instead of like Racheal Ray it will be like two 9–13 year old girls in front of other girls as the audience. It will be really fun! They get to make whatever they want and each pair will have a turn to go up and present their stuff. And it’s a sleepover. So please give me some tips.What the secret ingredients could be (just dessert stuff), games we could play during the sleepover portion of the party (nothing innapropriate. there is gonna be a 3 year old girl and a 5 year old girl. Plus we are not innapropriate people), any games we could play, ideas for the invitations, foods for the actual dinner, i would enjoy some drink recipes, just anything you can find!! Thank you so much! I know this a lot to ask for but I really want this party to be perfect!! And please dont say ’‘do the research yourself’’ because at this very moment that you are reading this sentence I am probably on google or something looking. Ok thanks again!