Hi Hannah!
Thanks for reaching out! We do not have a demo page for Aggregator, as it is in the admin Event Settings. You can see screenshots of the interface by visiting the product page.
Aggregator just adds more options to the existing “import” functionality of the Events Calendar, so you can get an idea by using the CSV import option.
Also, we have a 30 refund period on all of our products, so feel free to try it out to see if it meets your needs!
Hope that helps! Please let us know if you have any other questions.
Thanks,
Sky