Hi. Thanks for your question.
Event Tickets Plus is our paid add-on plugin that upgrades the functionality of our free Event Tickets plugin.
Event Tickets Plus enables you to sell tickets via one of our supported eCommerce platforms. The free plugin only enables free RSVP-type tickets.
You can view our roundup/comparison of all the eCommerce plugins ET+ supports.
Our plugin uses your eCommerce plugin of choice, but your eCommerce plugin isn’t displayed for shopping pages. Please reference our Making Tickets KB article (screenshots are from an install using WooCommerce) for an idea how to create tickets for an event.
Site visitors would purchase tickets from each event’s single page/view (e.g. example.com/events/rogers-day-at-the-zoo/) — if there is an RSVP to submit or ticket to purchase.
I hope this info helps. Please let me know if you have any follow-up questions.