Hey Derek,
While having many authors creating posts, pages, or events, or any other post type is a default feature of WordPress itself—so, yes, it’s possible with our “events” post types—this feature is not something any of our plugins would do:
They also want to capture volunteers to work with them (so I could in theory set up a dateless event called “volunteer for this org”) and track/manage those volunteers.
That sounds like something you’d need a Forms plugin to pull off, like Ninja Forms or Gravity Forms.
I hope this helps!
George