Claire Wynarczyk did a blog on whats been happening with her. I am sure when you get to the crowds you will feel better, think positive and know you can do it. I may be 6ft 3in but I walked inbetween places on Monday and did 3.5 miles (yeah I was home for a short time). You will be fine. I know people who have enjoyed Robbie Williams concert (Glasgow was last week) and my niece Katie enjoyed Harry Potter thing in London. So I hope some of the traffic i have been getting here helps.
Keep up the good work.