Europa was a Dogma 99 LARP run by the Scandinavian LARP group Weltschmerz in 2001, at a camp at Vestby, Norway, some kilometers south of Oslo. It took place in an alternate universe in which Scandinavia became something like the Balkans after the collapse of Yugoslavia -- with hyper-nationalist governments, oppression of minorities, ethnic cleansing, and outright war. The camp became a refugee center in the peaceful, prosperous, and imaginary country of Orsinia, located somewhere in the Balkans, where the players had all fled, seeking asylum.
It should be noted that the actual players of the game were of mixed ethnicity -- many Norwegians, but also many Swedes (a bus from Stockholm was provided for Swedish players), and a sprinkling of Danes and Finns as well. Part of the process of character creation involved helping the players to imagine the atrocities perpetrated against their own ethnicity by the evil oppressors of the others, and giving them concrete reasons for their characters to hate those from other countries.
Some of the players (including, one assumes, many of the larpwrights) took the role of Orsinian refugee center employees, interviewing asylum seekers and applying their own bureaucratic rules. As is typical of all countries, the Orsinians were not eager to admit a bunch of destitute refugees, many of them traumatized by their experiences in the Nordic conflicts, and sought to deny refugee status to as many as feasible, sending them back to life in the wartorn Scandinavian countries. For greater similitude, the Orsinians themselves spoke mainly in "Orsinian, a Slavic language related to Russian" (that is, in Russian).
Players were expected to keep in character for the full four-day duration of the LARP. In keeping with Dogma 99's precepts, no game systems were used to simulate anything; violence was discouraged, but everything else must be acted out. The only constraints on this "hard core" roleplay were akin to bdsm safewords -- "off-game stop" being an emergency stop, and "off-game relax" being the equivalent of an "amber safeword," an injunction that limits are being neared and that care must be taken.
The materials available -- the player sourcebook and instructors' handbook -- are interesting, and could be used as the basis for a reimplementation -- but only hint at what the experience must have been like. A player's post mortem is helpful, but while it suggests that the event must have been emotionally impactful, and thought-provoking on the subjects of the treatment of refugees, the ease of inculcating hatred, and the inhumanity of bureaucracy, it again only hints rather than showing.
Of course, if you were to try to stage Europa again, you would have to modify it extensively, unless you are Scandinavian; you'd need to focus on a different set of differences, and a different backstory. It shouldn't be hard to find something reasonably equivalent anywhere, of course. Race is the obvious one for the US.
Reading through something like the Europa documents makes me despair of "games for change" types who want to explore issues like this and meaningfully impact peoples' attitudes with, say, Flash applications. Games can do this; games can be powerful. But not with a platformer, for God's sake. This is how it's done.