The first step when setting up online ticketing for an event is to clear the budget codes through Finance. Please fill out this request form before you start with production on your online ticketing.
This is the process for setting up an online registration form for your event, as long as that registration can be free for everyone.
Ticketed Event forms are a bit more complex than an event registration form, but they're more versatile. You can charge admission for the event, set up multiple ticket levels, and allow the ticket buyer to get tickets for more than one person at once.
THE EMAIL MACHINE, the content management system Audubon uses to create email content, has an "Event Message" type designed for event invitations.