Event Pro and RSVP
Both of our free plugins should work together. If you find that isn’t the case, please submit a report on the support forums for each The Events Calendar https://wordpress.org/support/plugin/the-events-calendar and Event Tickets https://wordpress.org/support/plugin/event-tickets.
Please confirm in your post that you’ve run through our Testing for Conflicts https://theeventscalendar.com/knowledgebase/testing-for-conflicts/ steps prior to contacting us–this will save us a step and help us to get your issue resolved that much quicker! 🙂