i'm getting a lot of pm's from people flying in to the party that want to know which airports, how to get to brixton, and where the church is...
st matthews church. when you get there the queue will be near the fountain. if you don't know which direction the church is from the tube station....if you're coming out of brixton tube on the escalator, turn left and walk straight...no turns till you see the black gates of the church. the first tube train is 530am on saturday. 
http://maps.google.co.uk/maps?f=q&sourc ... 7&t=h&z=16
whether you're flying in from europe or elsewhere...the closest airport to dmz birthday is Gatwick. That will be the easiest choice if you're only there for the party and flying out the next day. gatwick is about an hour and a 1/2 from Brixton by train. you can also take a mini cab from brixton to gatwick but it'll be anywhere from £60 to £100 or more. transport info here...
http://www.urban75.org/brixton/info/transport.html
if you're heading north back into london after dmz, the buses north to victoria and beyond leave from in front of brixton mcdonalds.
http://www.tfl.gov.uk/tfl/gettingaround ... s-2035.pdf
for other london transport...
http://www.tfl.gov.uk/gettingaround/1106.aspx