There used to be a way to view all events with Shops. I used this frequently to support tourneys I don't attend but now it's much harder to find them again.

EDIT: Looks like it still exists at https://smash.gg/shops but it is no longer listed anywhere on mobile. I just found it again via my history.

EDIT 2: The page scrolling just seems to be a bit broken on mobile (Chrome Android, Pixel 2 XL). You have to scroll all the way down (and it'll stop you), release, then scroll more to hide the URL bar to make the Shops and Fantasy links appear. The page then expands to compensate. This makes them essentially hidden from view on mobile.

3 screenshots attached, hopefully in order. Initial view after scrolling, view while doing the second scroll, view when releasing second scroll.