Stars from the Narnia and Harry Potter movies are getting together at the Thames Festival in London, giving fans a chance to find out about their fave films.
Narnia star Anna Popplewell will be joined by the stars of the small screen including Daniel Anthony, who plays Clyde in The Sarah Jane Adventures.
Fans will get a chance to mingle with them and we want to know what celebs would you most like to meet and why?
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"I would love to meet Ashley Tisdale and Miley Cyrus. They are my all-time faves."
Erin, 11, Leeds, England
"I would love to meet MY CHEMICAL ROMANCE! I love them all so much and think they ROCK! If I had to pick one I would pick Frank Iero! He is the coolest!"
Ray, 12, Birmingham, England
"I would love to meet Sophie Bennett, Kia Luby, Keenan MacWilliam and Lara Marshall from the Saddle Club because they are cool actors and singers. I love them so much!"
Anna, 11, New Zealand
"I would love to meet George Sampson because he is most cool on TV and will make a big success in the next few years."
Brogan, 11, Swansea, Wales
"I would most like to meet either Ashley Tisdale or Miley Cyrus; they are the both best actresses I know."
Liberty, 9, Berkshire, England
"I would love to meet Lindsey Shaw, Daniel Lee Curtis and Devon Werkheiser from Ned's Declassified School Survival Guide because I think it is totally hilarious."
Amy, 14, Wigan, England
"I would love to meet the cast of Harry Potter. It would be a dream come true. I'd most like to meet Bonnie Wright! She rocks!! Or the cast of HSM!!!'"
Izzy, 11, Oxfordshire, England
"Matt Bellamy - lead singer, pianist and guitarist of Muse."
Adam, 11, Swansea, Wales
"I would love to meet Rachel Weisz from The Mummy because she is so funny."
Rebekah, 13, Liverpool, England
"Natasha Bedingfield! I love her songs!"
"I would LOVE to meet the Jonas Brothers and Demi Lovato! CAMP ROCK RULES!"
"I would most like to meet Michael Phelps because he is a sports hero and I would love to see his medals."
Mariam, 12, Glasgow, Scotland
"Mika, Mika, erm, Mika, oh, who was it again? Oh, yeah, MIKA!!! And last but not least... Mika."
Rebecca, 12, Leicester, England
"I would like to meet the Jonas Brothers for I feel they are extremely talented. Whenever I hear their music it's like I'm in my own world! They are fabulous and I am pretty sure they are wonderful people in life."
Zenib, 12, Leeds, England
"I would love to meet Drake Bell, Josh Peck and Miranda Cosgrove. That would be so cool and I would be the envy of my friends!!"
Leah, 11, England
"I would love to meet Vanessa Hudgens and Zac Efron. It would make my dream come true."
Rosy, 14, Manchester, England
"I'd like to meet Terry Pratchett because I absolutely love his books."
Tilda, 11, London, England
"I would love to meet the cast of High School Musical but I would really love to meet all of the CBBC presenters."
Chantelle, 15, Essex, England
"Ashley Tisdale as I am her number one fan, and she rules."
Jackie, 12, Staffordshire, England
"It would be a dream come true to meet the cast of High School Musical!!!"
Hassan, 13, Manchester, England
"I would most like to meet the JONAS BROTHERS!! That would be amazing!"
Rebecca, 15, Brighton, England
"I would love to meet Johhny Depp!!!"
Callum, 12, Kent, England
"I would like to meet Vanessa Hudgens and all the Narnia cast!"
Holly, 12, Spain
"I would love to meet Rihanna, she rocks!!!"
Ellie, 11, California, USA
"I would absolutely love it if I could meet the three most famous wizards (Dan, Emma and Rupert), and also Orlando Bloom and Keira Knightley because I love them all sooo much!"
Fatema, 12, London, England
"I would like to meet Girls Aloud."
KT, 11, Manchester, England
"I really want to meet Shania Twain, she is the best singer in the world."
Shannon, 11, Norwich, England
"I would love to meet Rihanna or Girls Aloud as they are my fave music acts. But I'd also like to meet the Queen."
Hannah, 13, Fareham, England
"I would absolutely love to meet the EastEnders and Hollyoaks cast and the Spurs football team and Zac Efron!"
Cosmo, 11, Cambridge, England
"I would love to meet the Jonas Brothers and Hannah Montana, they rock."
Emma, 11, York, England
"The person I most want to meet is Emma Watson. She is my favourite actress ever and I think she rocks!"
Lizzie, 10, Durham, England
"I would love to meet Will Smith! He is the best actor and rapper!"
Natalie, 12, Buckingham, England
"I would love to meet Ashley Tisdale from High School Musical."
Ruth, 11, Grimsby, England
"I wouldn't want to meet any celebrities, because there really isn't really anything to do, other than compliment there newest album."
Sumboy, 13, Redditch, UK
"I would love to meet all of the High School Musical and Hannah Montana cast!"
Vanessa, 10, Doncaster, England
"Definitely Hilary Duff! I love her music!"
Duncan, 12, Surrey, England
"David Tennant and the Harry Potter trio !!!"
Jessica, 13, Sheffield, England
"I'd Like to meet Doctor David Tennant and all the cast of Doctor Who, Torchwood and Sarah Jane Adventures!!"
Charlie 11, Nottingham, England
"I'd love to meet Daniel Radcliffe as I'm a major fan."
Paul, 11, Thornley, England
"I would love to meet Tommy Knight, Daniel Radcliffe and Emma Watson. They are all soooooo cool!"
Octavia, 11, Sunningdale, England
"My most fave celeb to meet is Destiny Hope and Anna Popplewell."
Hollie, 13, Camden, UK
"I wish that I saw Hannah Montana."
Aisha, 9, Wimbledon London
"I would like to hang out with the JONAS BOTHERS! They RULE and they are the hottest boy band in the world right now!"
Saraf, 12, Aberdeen, Scotland
"I would LOVE to meet Jonny Depp! He's an ace actor and rocks!!!"
Emma, 11, Wick Scotland
"I would really like to meet Simon Cowell to see if he is really mean like they say!!"
Evie, 12, Presteigne Powys
"Kylie! That would be so cool!"
Georgia, 9, Kent, England
"I would love to meet Anna Friel because she is such a brilliant actress! Also I would love to meet David Tennant and Thomas Sangster!"
Anna, 11, London, England
"I would LOVE to meet Girls Aloud. They are the best I love Kimberly the most, she is so pretty! And I would like to meet Rihanna - I love her music!"
Chelsie, 11, Old Colwyn, Wales
"I would really love to meet Ashley Tisdale and Miley Cyrus and all the High School Musical cast and the CBBC stars and Maddy from Newsround and some famous Olympians and Paralympians."
Rhianna, 13, London, England
"I would love to meet Jon Pertwee, he played the Doctor from 1970-1974. He was absolutely fabulous, better than David Tennant!"
Jack, 12, Portrush Northern Ireland
"I would love to meet the Jonas Brothers, Miley Cyrus, Emily Osment Milly and Becky Rosso. I think they are all cook!!! "
Ellyn, Lincoln, UK
"Anna Popplewell rules."
Lucy, 9, Cheltenham, England
"Ashley Tisdale - she is ACE!!!"
Josh, 12, Paignton, England
"I would like to meet: Miley Cyrus, Zac Efron, Vanessa Hudgens, Ashley Tisdale, Rihanna, Hilary Duff, Daniel Radcliffe, Beyonce, Enrique Iglesias, Simon Cowell, Girls Aloud and believe me there is a lot more. Out of all of them I would mostly like to make Miley Cyrus, BECAUSE SHE IS MY ROLE MODEL :), but unfortunately I can't see any celebs at the Thames Festival because I live in Spain."
Ashleigh, 13, Spain
"I would love to meet Kylie Minogue, because I LOVE her music and she is so nice and pretty!!"
Kathryn, 11, Stornoway, Scotland
"I would like to meet Ashley Tisdale."
Emily, 10, Southall, England