Hi Manuel,
Thanks for checking out our plugins!
With Event Aggregator, you can hide and ignore imported events, which will prevent them from being duplicated in subsequent imports.
By default, you can export events to a .ics file, but there is not an out of the box way to schedule exports. However, I would recommend taking a look at the WP All Export plugin, which many of our users use to export events. It supports CSV and XML, and it’s Pro version does let you schedule exports.
Regarding a theme, our plugins tend to work with most standard WordPress themes, although some may require some tweaking to fully integrate. This article lists a few that are known to work pretty well with our plugins!
We do offer full refunds within 30 days of purchase if you’re not satisfied with the products, so feel free to test them out. Let me know if you have any other questions!
Thanks,
Jennifer