Hi Lauren,
Thanks for checking out our plugins!
The Community Manager bundle does work without Events Calendar Pro. You will need our free base events and ticketing plugins The Events Calendar and Event Tickets, but otherwise the Community Manager bundle has everything you need.
Event Tickets includes RSVP functionality which allows users to indicate that they are going or not going, no purchase necessary. This does generate tickets for them by default, so if you wanted to change this, you would need to do a customization.
We do offer full refunds within 30 days of purchase, so if you’d like to take the Community Manager bundle for a test run to make sure that you can get it working the way you need, feel free to do so! Please let me know if you have any additional questions.
Thanks,
Jennifer