My nephew turned to me for advice. He wants to throw a party for his classmates (Junior School), but doesn't know how to entertain his quests, because everyof them has his personal hobbies and preferences. How can I help him organize this party?

I haven't organized children's parties for a long time, but if the cartoon marathon is too boring for them, then maybe the theme party will be interesting for everyone? I know that children love clowns and magicians, so you could find an animator in your area or try to give a master class to learn (or demonstrate) magic tricks, easy acrobatic moves, games for dexterity and ingenuity. Perhaps you will find on the Internet a script for a quest for a children's party and be able to implement it.  I found a site on the internet with Free Tricks To Get Started and my little brother really liked the idea. Perhaps you can also interest your nephew and his guests in this.