An event is something that happens, like a birthday party or a school field trip. The structure of an event is like a plan that helps everyone involved know what to do and when to do it.
Think of it like building blocks. The first block is the beginning of the event, when everyone arrives and starts to get settled. Then there are different blocks for different things that happen, like playing games or eating cake.
Each block has a specific time and place in the event, so that everyone knows what to expect. For example, the block for playing games might start at 2pm and be in the backyard. The block for eating cake might start at 3pm and be in the kitchen.
The event structure is like a map that helps guide the event from start to finish. It makes sure that everyone has fun and that nothing important gets left out.