The poet is in Brixton because there are a lot of social riots in that area and he wanted to do something about it.
Step-by-step explanation:
The poem "Midsummer" was written by Derek Walcott. The poem is about the riots which happen because of the discrimination of the different classes of the society and the racial discrimination.
The poet does not like all this and he wanted to find a solution for it. He said that the perspective of a person can also be affected by the nationality and the gender of the person which he says might give rise to riots to these differences in the social class.