I found out about this contest on the Canadian Homeschooler's Board under their Writing Contest thread in their Language Arts Thread.

Rachel Starr Thomson is a homeschool graduate living in Canada that has written a number of books.  In celebration of the upcoming publication of her most recent book - Tales of the Heartily Homeschooled - she is running a writing contest for children ages 8-18.   Here's what she says on the site: "If you are between the ages of 8 and 18 and you have a funny, dramatic, or touching true story you'd like to share, write it up and send it in!"  There will be a winner in each of 4 different age group categories - 8-10, 11-13, 14-16, 16-18.  Each winner will recieve an autographed copy of her book.

Here are the guidelines from her site:

Entry Guidelines:
Stories should be between 500 and 2000 words. All entries must be based on real life events. Put "Family Fun Story" in the subject line and paste the story into the body of the email--no attachments, please. In the top left corner, include your name, age, and email address. Email your entry to publisher@littledozen.com.

I'd love if if you'd let me know if you enter the contest.  Hey, I could even post the entries here once the contest is over!  I'm sure that you have stories to tell and that others would enjoy reading.  I sure hope you'll share your story.