And you can join! How? Their project has two parts:

1) Showing appreciation for Jo by sending in stories, letters, etc. 
2) Make a donation to Comic Relief!

You can submit your own made story/letter/card to them, ofcourse Harry Potter/JK Rowling related. Another goal they want to reach is raise $1.000 for Comic Relief. They have 5 months for that. The project will continue until July, then they will send the whole scrapbook with pictures to Jo.  More info at jkrowlingbirthday.com.

🠖 Red Nose Day donation account.

Comic Relief is a major charity based in the UK which strives to create a just world free from poverty - and they work 365 days a year to help that vision become a reality. Jo has supported Comic Relief in the past by donating the proceeds from her books Fantastic Beasts and Where to Find Them and Quidditch Through the Ages to the fund.

He mentioned in passing that there has been talk between him and producers Craig Zadan and Neil Meron about doing a big-screen version of How To Succeed. But if that were to happen the book (by Abe Burrows, Jack Weinstock and Willie Gilbert) would have to be overhauled. It works fine on stage, but for the screen someone would have to give it more zing.

And about the dancing:

‘Sometimes I was dancing for nine hours a day when I wasn’t filming,’ Daniel told me.
‘The thing was to keep practising and practising until you could do it without thinking about it. The aim was to be effortless — or to appear to seem effortless.’
‘I didn’t want the last Harry Potter film to come out and people to say: “So, what does he do now? How does he follow that?” I’m already doing it! I’ve made another film and I’m on Broadway for the second time,’ he told me, in a reference to his five-month run in Equus — a repeat of the part he’d played in the West End.
‘I’m doing this for nine months, and I did Equus for five months here and that felt like a long time. I was exhausted after that, so I have to learn to keep my energy levels up with diet and exercise.
‘The rest of the cast work tremendously hard, but I have just two big numbers — Grand Old Ivy and Brotherhood Of Man — and there’s a lot of dancing and singing. They’re exhilarating to do and I love that this is so different from everything else I’ve done. I’m not repeating myself,’ Daniel added.

From the press release:

Warner Bros. today unveils plans for the Warner Bros. Studio Tour London – The Making of Harry Potter. This unique walking tour will give visitors the chance to go behind the scenes of the most successful film series of all time and witness the intricate detail that goes into a working set to see first hand what the camera doesn’t show. The announcement was made by Dan Dark, SVP & Managing Director, Warner Bros. Studios Leavesden.

“I want to prove that a child actor can go on to have a career with longevity.”

source: nytimes.com

How has it been working with Daniel Radcliffe and John Larroquette?
Sadly I am not in very many scenes with John so we have not had much chance to work with each other, we have one scene with a few lines and that is all. But he is lovely. And Dan, Dan is incredible He is a wonderful person, and he has such great energy and he comes to work every day ready to get things done and to work and to learn, he's got this infectious energy around him and that is a lot of fun. We're buddies, so we have a good time.

Blu-ray extras (the ones featuring Daniel):

• ”Dan, Rupert and Emma’s Running Competition”: Director David Yates provides commentary for the “hilarious rivalry” that the three leads engaged in while filming the escape scene from the Snatchers in Swinley Forest. (This sounds even better than “Taylor Time” on The Twilight Saga: Eclipse DVD, which was what they dubbed the moments in the making-of documentary when Taylor Lautner was shown catching grapes in his mouth thrown from people like Kristen Stewart and director David Slade’s assistant from great distances.)
• “The Seven Harrys”: A look at Daniel Radcliffe’s method for recreating the personalities of the different characters for the Privet Drive scene, as well as the visual effects. (Read: Shirtless Radcliffe.)
• A plug for The Wizarding World of Harry Potter that includes footage of Radcliffe, Grint, Watson, and other cast members enjoying their first visits for the grand opening.

In the final installment of the Harry Potter series, the young hero finally outgrows the Hogwarts School of Witchcraft and Wizardry. So it is fitting that the movie franchise has become so popular that its film premieres have finally outgrown Leicester Square.
Warner Bros today announced that the premiere of Harry Potter And The Deathly Hallows Part 2 will take place in Trafalgar Square as well as its regular home in Leicester Square. It will be the first red carpet movie event held in Trafalgar Square and one of the biggest film premieres seen in the capital.

Daniel Radcliffe, Rupert Grint and Emma Watson will head the cast members at the premiere on July 7

And will Daniel be there? well tickets for How to Succeed in Business Without Really Trying are not on sale for 7th, 8th July and 9th July, so yes it seems he will be flying to London! (see the tweet from How to Succeed here) There's no info yet about the US premiere(s).