Hi there Darius,
Thanks for getting in touch with us and sorry to hear about this issue! I’ll help you out 🙂
First all let me say I visited your events page (http://tabletennis.lt/events/) and could successfully narrow down results by using the category filter. So maybe you could fix this issue already?
I do see something in the browser console) that could cause some JS errors:
You have included the Google Maps API multiple times on this page. This may cause unexpected errors.
Looks like the Google Maps API is being included multiple times. One by our plugin and another one by another plugin or the theme. Can you please take a look at this?
Please let me know about it,
Best,
Nico