Hi Mike,
Thanks for checking out our plugins!
There is not currently any waitlist functionality in the free version or the Pro version (Events Calendar Pro). Sorry for the bad news! If this is a feature you would like to see added in the future, we’d love it if you could post the idea in our Feature Ideas Forum! We use it to gauge user interest in new features and help plan future development.
We do offer full refunds within 30 days of purchase, so if you’d like to take Events Calendar Pro for a test run, feel free to do so! Please let me know if you have any additional questions.
Thanks,
Jennifer