The city has been steadily developing under your leadership! These days more and more citizens want to move into your town. But moving's expensive, which is why some of them have decided to hold a fundraiser to help cover moving costs! If you'd like to support them, you can watch an ad so that a sponsor will contribute to the citizen's fundraiser and help him or her move into the city.
Each citizen's fundraiser is different. It may last 14 days or more. For the fundraiser to be successful, you have to help the citizen reach 100% of their fundraiser target before time runs out! If you don't hit 100% before the fundraiser ends, you'll have to wait for the next time it comes around again.
Note: In addition to you watching ads, your own citizens will also occasionally contribute to fundraisers to help their new friends move in!