Decalburg is the main town in the Sticker Star. It has a shop where Mario can buy stickers as well as a museum that records and describes each sticker donated to it in a compendium. Decalburg is also home to the Sling a Thing booth where "Thing" items can be converted into Thing Stickers.
Sticker Fest Grounds
The Sticker Fest Grounds is an area in Decalburg where Mario can see the requirements for various achievement-style sidequest feats. When completed, they add a decorative flag to the Sticker Fest Grounds. As Mario progresses, collecting more Royal Stickers, the Toads of Decalburg will gradually repair more of the ruined Sticker Fest Grounds destroyed by Bowser.