Hey Doug and thanks for reaching out! I’m really stoked to hear that The Events Calendar has been working out on your site. 🙂
Man, that’s an awesome question and something we are actually working on. Our Community Events add-on allows visitors to submit events to the calendar and what we’re working on is a solution that would allow them to create tickets as well. We have started a beta program for it, if you’re interested, which you can sign up for here.
In the meantime, I’m afraid Eventbrite Tickets is going to fall short of what you’re looking for. It’s great for syncing events between WordPress and Eventbrite.com, but not for community ticket sales in and of itself.
Sorry for the bad news here, but does this at least help answer your question? It would be great to see if the beta product we’re testing will be a solid start in that direction!
Geoff