These are my ideas for invention convention:

• A foldable puppet show that folds into something easy to carry
• A cat obstacle course
• A custom cat toy
• Something that shows you your stove and doors at night so you can make sure everything is locked without leaving bed
• A foldable playground/obstacle course for boring backyards
• An umbrella heater for eating outside or walking long distances in the cold
• A button on your bike so when you are biking and you are too far away from your parents then you press it and your parents will get an alert on their bike
• A pop-socket to hide things in
• A slot for your purse for your boarding pass when you are flying
• A book with a built-in light
• Clothes your cat will actually like
• An ice maker that dispenses food and juices