The UK Labour Party has been straining for many years to make the UK more multicultural. They are achieving this goal through having altered immigration laws to make it easier for penniless and uneducable third world immigrants to move to the UK, and receive generous public benefits paid for by UK taxpayers. The Labour Party assumes that a more multicultural UK will help them to achieve and maintain power, since a multicultural UK will be more dependent upon big government and public benefits.
According to Wikipedia the black population of England constitutes only around 2% - 3% of the total population. But as was seen in the multicultural events of the past week, when concentrated into sections of cities such as London, Manchester, Birmingham, etc. this mere 2 to 3 % can pack quite a punch. Imagine the impact of a 10% black UK on multicultural celebrations, or perhaps higher?
The UK police did little to dampen the enthusiasm of the events as they were unfolding, and the citizens who did step in to protect private property often suffered the consequences. If concerned citizens were not beaten or killed by the celebrants of multiculturalism, they were harassed by the police -- who may have been more comfortable confronting law-abiding citizens than standing up to multiculturalists.
As the growth of multiculturalism in the UK, Europe, North America, and Oceania continues, we absolutely will have to expect more jubilant street celebrations of this type throughout the developed -- but naive -- world.
What you just witnessed in the UK was indeed a party, compared with some of the events likely to be coming your way. This time, the anarchist left and the jihadist muslim populations were not ready to join in the party. Don't expect to be so lucky next time.
Hope for the best, but prepare for the worst.