Hi Thanks for the interest in Community Events.
The plugin is made to work with as many themes as possible, but issues can arise not fault to either side that we might not be able to help with.
We test our plugins in the WordPress themes Twwenty-Twelve, Twenty-Thirteen, etc… only.
You can setup the free version of the Events Calendar(it is required for all add ons) and if that works with the theme then most likely Community Events will too.
Community Events does not include a method to off subscription, but a member plugin could do that and you could modify Community Events to check for that member following a member plugins steps and using our themer’s guide:
https://theeventscalendar.com/knowledgebase/themers-guide/
Let me know if you have any follow up questions.
Thanks