In other words, it became the civic responsibility of all the Swedes at the festival to ensure that foreigners-- who had no access to goods/services-- were properly fed, hydrated, and housed.

Actually, this sounds like it could become a utopia given the right social strategy by the Swedes. They just need to buy beers, lunches, and festival tickets for the kinds of tourists they desire. Then ignore the loud obnoxious ones who will become hungry and irritated and end up leaving early and never coming back to Sweden.

Of course the risk is that it is even more cost effective in the short term for the citizenry to become xenophobic.