Successful engagement of alumni is rather a happy teamwork than just the small Alumni Team's individual interest. It is beneficial for several entities within the institution. High time to involve and encourage them by drawing their attention to their benefits and letting them know what they can do for it? Let them understand that this is a win-win situation and by frequent brainstormings this process is much more simple than they think. Time to start a delightful cooperation within the institution. "Beautiful is what is beautiful without interest" but benefits are real benefits - worth working on.