:00:00. > :00:00.Hi, I'm Martin with your live Newsround update.
:00:00. > :00:10.The Sport Relief 5-aside football challenge kicks off.
:00:11. > :00:23.And your amazing World Book Day costumes.
:00:24. > :00:26.First, you might have found yourself sharing a classroom
:00:27. > :00:29.with Where's Wally and Little Red Riding Hood today.
:00:30. > :00:32.That's because it's World Book Day - the annual celebration of reading
:00:33. > :00:36.that takes place in more than 100 countries across the globe.
:00:37. > :00:49.Ricky's been finding out who's inspired you this year.
:00:50. > :00:51.Gandalf from the Hobbit and Lord Of The Rings.
:00:52. > :00:53.This is going to get uncomfortable later today.
:00:54. > :00:56.Will you try to stick it out for the whole day?
:00:57. > :01:05.Archie, tell me who you are dressed up as today
:01:06. > :01:09.I am dressed up as Hamish because this is our book club book
:01:10. > :01:12.and that is the book that we are reading at the moment.
:01:13. > :01:18.I went to a fancy dress shop but I found this stick on a walk.
:01:19. > :01:23.Because me and my mum wanted to do something that's
:01:24. > :01:26.fun and that people may wouldn't think of.
:01:27. > :01:29.I think it's really fun because we get to pretend
:01:30. > :01:32.And how long did it take you
:01:33. > :01:39.You're not as a character, you are dressed as an author.
:01:40. > :01:45.I like that at the end, they have a really weird
:01:46. > :01:59.Lots of you have been in touch to let us know
:02:00. > :02:03.At Grace's school in Linlithgow, every time a bell rings
:02:04. > :02:10.Uzayr in London has dressed up as his favourite character
:02:11. > :02:14.Alice in Hampshire is taking part in a challenge to have her picture
:02:15. > :02:20.Next, there's a football match going on outside the studio
:02:21. > :02:22.here today, but it's a game with a difference.
:02:23. > :02:28.It's all in aid of Sport Relief, with ex professional footballers
:02:29. > :02:32.Alan Shearer and Robbie Savage captaining the two teams going up
:02:33. > :02:38.Naturally being a massive footie fan, I just had to pop out
:02:39. > :02:49.Bring on the high me right now is the Sport Relief set to seven hour
:02:50. > :02:53.battle of the five asides. Over the next three days, over a thousand
:02:54. > :02:57.people will be going on that pitch including your favourite celebrities
:02:58. > :03:00.like singers and actors. But it is not just liberty is, people from the
:03:01. > :03:04.general public are making up the side as well. I've got two very
:03:05. > :03:09.special people with me right now. James and Oliver. You place
:03:10. > :03:12.special people with me right now. Weasley twins in Harry Potter. 24
:03:13. > :03:19.talking to me. I've got to say, this isn't credits all right what are you
:03:20. > :03:24.thinking going out there. I'm going to try not to get hurt but that
:03:25. > :03:26.makes it a good game of football I'm looking forward to it. Have
:03:27. > :03:29.makes it a good game of football I'm special tactics that no one knows
:03:30. > :03:39.about? Simek if one of us gets booked, I will have the card. How
:03:40. > :03:42.many cards are you going to score. More than him. As long as they get
:03:43. > :03:43.more than my brother I'm happy with it.
:03:44. > :03:46.There'll be all sorts happening on that pitch -
:03:47. > :03:47.mens football, womens, kids, wheelchair -
:03:48. > :03:50.Keep watching Newsround for all the latest from that
:03:51. > :03:53.Sport Relief 5-aside challenge over the next few days.
:03:54. > :03:55.That's all from me for today, I'll leave you with just some
:03:56. > :03:58.of the amazing photos you've been sending us today