I Will Be At MCM Expo (Also, A Request!)

Hey, all! I will be at the wonderful-sounding MCM EXPO in London the 28-30th of October. I'm excited, it's my first trip to London. I hope some of you guys can make it!

Also, we're staying four extra days, and I'd like to ask the advice of people familiar with the city. What would you recommend we do there, what's great to see if you only have a few free days?