hey Sherry, we're using it in two ways, sometimes with more success than others. :) The problem is that the people who ultimately run our events are at an executive level (read: they don't really get "into" Workfront)
One of our divisions is using a request queue as an intake form -- the event request gets forwarded to a traffic manager who will assign out to several project managers as needed.
Our other division uses a single project per event, assigning out work to Design to build the pieces needed for the event, but I notice that they opt to do a lot of actual event management (management of the attendees, flight info, coordination of event location) outside Workfront.
In other words, whether they use a request or projects, our users appear to be primarily focused on the pieces we have to create rather than the workflow it takes to create an event proper.
I hope that helps!
-skye