It would be really nice if you can search/filter on multiple locations. Locations being not only cities like Rotterdam and Amsterdam but also countries. For instance I would like to search/filter for Netherlands + Sweden. The multiple cities and countries mode is especially useful for music geeks like me who plan city trips and holidays around concerts and festivals. I would rather pick multiple locations/countries myself than the option of a 'my location' and draw a 100 square km circle around it.