Start small- phone calls, clean up, making copies etc. As our DE explained it at our graduation (we have the same few people doing everything in our pack as well) "One person could not possibly eat a 20ft sub by themselves in one sitting, but if you had each person take a small bite or two it could get done." Don't be afraid to ask the "busy" people, they get things done quicker because of limited time. Instead of waiting for someone to offer help, be direct in what you want and need. Good Luck!