Most of those treats would include soda, candy, chips, cupcakes, cookies etc. Adults might not want their kids having all those treats, so you could have a healthier sale with fruit trays and water bottles.
It is possible to create a dual-type Eeveelution such as Dragon/Ghost type, as it is your creation. Though Eevee currently has no dual-type Eeveelutions, this should not prevent you from...
Healthy snacks include fresh fruits and vegetables and lean protein sources, like an apple with peanut butter, hummus with carrot sticks, or sliced cucumbers with cheese.
Get some adult help, or even someone who has done a talent show before, and get your friends to help too. Set us a schedule of performers, look into advertising...
