Some say its not his thing...but if you are his only daughter or all of his kids are daughters that is highly unlikely. He probably does not want to go dress or shoe shopping but having a personal hand on a few touches will make him feel a bigger part of your day. Here are a few thoughts:
1. Have him suggest dances songs that the older crowd will enjoy. Remember if your inviting great aunts and older generation you will get no movement from a large portion of your guests if it is all new age beats.
2. Ask him to prepare a toast
3. If his is computer savvy have him make the map
4. Put him in charge of making sure ALL of the men's formal wear is on site and on time
5. Chef celebrant means staying to the bitter end to encourage and drive a festive mood!
Dad's are excited too you know!