Howdy Michelle,
Out of the box our plugin allows Editors of your site to post/edit events. So, if you want to make some users editors, then they will be able to add events, including tickets, just like you can including adding tickets.
Side note: If you wish to modify the plugin from there, or perhaps create an additional user role, our plugin does fully support the WP Roles API in that regard. But, as with any API some programming will be required.
Does that make sense? Will that work for you? Please let me know. Cheers!
– Brook