You can use Classlist events to collect information, and this includes Gift Aid declarations.
When you create your Community event choose 'add tickets' and then in that section you can add the Gift Aid questions.
Parents can fill out the Gift Aid declaration and questions when they buy the tickets.
Then you can simply download the spreadsheet of ticket purchases and that will have all the parent Gift Aid responses.
It is your responsibility to ensure that the money you are collecting is eligible for Gift Aid. Classlist does not take any responsibility.