You could walk past the covered market by Seven Sisters tube as it is quite a hidden place. There are shops and two cafes in front, so just find the double doors and enter a tiny corner of Latin America.
There are about fifty stalls selling a variety of things from South American beauty products and canned and dried food stuffs, Spanish-language music and films to a whole stall of cheese and sausages. It is a lively jumble filled with music and families. Mainly Columbian but there are stall holders from Peru, Ecuador and Brazil and some of the original Afro/Caribbean traders, including a well stocked Afro/Caribbean bookshop.
There are a few cafes serving Columbian food and strong coffee which will keep anyone awake for days. It mainly just seems to be a social centre where Latin people chat with their friends and families. Saturday early evening is party time. Closed on Sunday.
A real gem but hard to find. Sadly it is under the threat of the developer's hammer so pop along now. Better still add your voice to the plan to save it and drop an email objection to the planning department.