By default, RSVP and ticket forms on single events show up below the event details where information like start time, end time, venue, and organizer is displayed. However, you can also opt to move the RSVP or ticket form around to different locations on the single event page. You can find this option under Events –> Settings –> Tickets.
If you do not have the Event Tickets Plus add-on for the Event Tickets plugin activated, you will only see one option–where to display the RSVP ticket form:
If you do have Event Tickets Plus activated, you will see one option for the RSVP form location and one option for the Tickets form location: