You can send Sayumi a message for her birthday!!!
One site is receiving messages for Sayumi's birthday until midnight July 13th, and then they will print them, bind them in a book and deliver it to her at the end of the Hello! Project summer concert at Osaka on July 21st.
Click on this link
It will take you to a page that looks like this
Click on either one of the links I circled out there. The first one gets you to a form for writing your message without it being displayed after, and the second takes you to a BBS style form where you can see the last 7 messages. The fields on those forms are:
On the first form:
1 - Title for the message
2 - Your name
3 - Body of the message
On the second form:
1 - Your name
2 - A title for the message
3 - Body of the message
4 - Your e-mail address
The other fields are not important, but to submit your message click on the left button, the right one will reset the form.
Since the site admin only speaks japanese, try to translate your messages into japanese. The admin needs to check for proper content on the messages, and there's a chance he will delete foreign language messages because he's not sure if the message is respectful or not.
So go ahead, send Sayumi your message and let her know she's loved outside Japan too!!!