I would like to run a marathon.
That is great! I know quite a bit about the London Marathon if you have any questions. 
When does it take place?
It takes place in London in the United Kingdom each year as part of the World Marathon Majors. 
How many people participate?
I'm not sure how many participants their are, but it's a big event! It's sponsor is Virgin Money. 
I bet it's a big event and would be lots of fun.
Absolutely! The last race actually just passed on April 22. 
Maybe someday I will be able to go there.
It would be so beautiful- the race is run around the River Thames.