Creating a dynamic form that allows your visitors to RSVP to an event on your WordPress website can be setup by following this tutorial, thanks to Pie Calendar and WS Form.
In this video, I’ll show you how to bring in the events start date and time in the form dynamically so that when users signup to the event, all that data is brought in automatically.
Pie Calendar: https://piecalendar.com/
WS Form: https://wsform.com/