What's the easiest way to get from St. Pancras International Station to the venue? Hop on the underground from King's cross and take the black line to Waterloo?
Either take the Picadilly Line (Dark Blue) to Leicester Square then switch to the Northern Line (Black) to Waterloo
or
Victoria Line (Light blue) to Green Park then swtich to Jubilee Line (Grey) to Waterloo.
Both should be around 15-20 minutes.