Hi Karoliina,
Thanks for reaching out!
These features are not built into our core The Events Calendar plugin, but they are included in Filter Bar. This will let users filter by a wide variety of parameters, including sub-categories. You can also configure the filters and allow users to select multiple categories. (There is a small bug with configuring active filters at the moment, which will currently mean that users can only select one category at a time. However, the fix for this is expected to be released soon – within the next two maintenance releases – sorry for the inconvenience here!)
This will work with any of your views, and users can still search by venues or name as they can now. We also offer a full refund within 30 days of purchase if you’re not satisfied with the plugins, so feel free to test it out!
Please let me know if you have any more questions.
Thanks,
Jennifer