Open Discover. Without an account you still see everything public, sorted by what is soonest.
Allow location once and the list re-sorts by distance from where you are. You can decline and still use Joinat; you just get date order instead.
For a specific area, use Map Search. Drag the map anywhere and press "Search this area" to see events within 50 km of that point, which is far enough to cover Muscat and its surroundings.