Hey Sanders,
Thanks for your interest. While I don’t have a specific list of themes, I can say that we do our best to make sure the plugins work nicely in a variety of themes. The new Events 3.0 in particular includes different stylesheet options as well as templates so you can adjust depending on how much style the theme itself provides.
You might want to peruse our old Showcase forum thread, where folks posted their sites to share with the community. That’ll give you a nice sampling of some themes that are working with the plugin. Just note that the thread is from the 2.x lifecycle, so some sites may be a little outdated now.
One of the best ways to test if a theme will work nicely is to try it with The Events Calendar, our free plugin. Generally, if a theme works nicely with the core plugin it will also look good with Events Calendar PRO. Furthermore, if you have a PRO license we can sometimes provide assistance with theme integration via our PRO forums.
Hopefully the above will help point you in the right direction. Good luck with the project!
Cheers,
Leah