Title speaks for itself but not sure how to follow up since I've missed the ones on home lol. But have it reoccurring at a certain time length of a month or so and on seasons as well if possible. Even though it may get stale, have it like a special event. And the rewards would be given after each task completed. And if you completed all the tasks, you get a personal space based on the Scavenger Hunt/Seasonal Event or a lmo/interactive animation. Also, the team of neotopia could pop in leaving a clue.