Hi there Monica,
Thanks for getting in touch with us and sorry to hear about this issue. I’ll help you out 🙂
First thing I’d try here is to follow steps described in our Testing for conflicts guide? This way we can see if this is a problem in our plugin or a conflict with the theme or other installed plugins.
I just gave this a try in my local test site and comments are working as expected on events page (when the option to enable them is check of course) with default theme Tweenty Seventeen.
Please let me know if the testing for conflicts yields any results,
Best,
Nico