The Happy Home Showcase (HHS) is behind the arch in the centre of Main Street and opens up once you visit Nook’s Homes after paying off your first loan.
The HHS allows you to visit the houses of people you’ve met via StreetPass. There are 48 houses in total and they will be replaced by new StreetPass hits unless you choose to save them by marking them with a pink heart.
New and updated houses are coloured yellow on the map. You can order up to five pieces of furniture from houses you see in the showcase.