Its not far at all from Grenwich/Canary Wharf/O2 arena which are served by the Jubilee underground tube line.

You will have to get a Docklands DLR train from the above that runs right to the Arena and takes about 10 mins.

Just a big warehouse style venue and not great views for a fight as it isn't naturally tiered.

Underground trains stop around 11.45-midnight so you'll have to leave early if your not staying at a hotel.

Dont make eye contact with anyone from Tower Hamlets either