We've found a lot of success by taking the list of responsibilities for any given event, i.e. food, decorations, video, etc. and asking folks what they're good at. We also found it useful to create signups for everything using signupgenius.com or similar (there are several out there). We were very specific in our needs and were able to find people who were a little more invested since they chose the area. Good luck - you'll do great!
#PeopleManagement