Hi Ivan and thanks for getting in touch! I hope that Community Events and The Events Calendar will both work well for you. 🙂
Good question. If the datepicker is not working, then it could be a conflict with the theme or another plugin. We use a Javascript plugin for the datepicker and it’s very possible that it is conflicting with the scripts from somewhere else.
There is a way to dequeue the calendar’s scripts, so that might be something you would be interested in trying to resolve any conflicts. You can also follow the troubleshooting steps listed here to pinpoint where any conflicts are coming from.
I also want to remind you that we have a really nice refund policy that allows you to return any of our products within 30 days of purchase, should something not work out as expected. Definitely take advantage of that if you’d like to test the compatibility further.
Does this help answer your questions? Please let me know.
Cheers,
Geoff