Hello,

And thank you!

I wonder if there is a way to upload images for multiple events in batch. For example, is it possible to upload 5 images using ftp to the server? Image file names would be the event ID, for example.

Unfortunately, not...

But i understand your purpose, and why you would like such a possibility to gain time in creating multiple events.
The issue in such a process is how to create one, with not too much options, and a real benefit for the extension and users (as an image should be linked to an event, the naming of files is not the only one needed. It should operate too a database query to update events... and other php functions to operate (thubmnails...)).
Or you can create your own sql request in PHP Admin depending on how you have named your images... but it supposes to have a bit of SQL knowledge.

Best Regards,
Cyril