Here are some links to resources for submission to have your work published at anytime during the year:

http://www.ckmagazine.org/submissions/  

Creative Kids Magazine - We are looking for the very best material by students (ages 8–16). Material may include cartoons, songs, stories between 500 and 1200 words, puzzles, photographs, artwork, games, editorials, poetry, and plays, as well as any other creative work that can fit in the pages of the magazine.

http://www.cyberkids.com/he/html/submit.html 

Cyber Kids Magazine:  We especially like stories, articles and poems that are funny.

http://www.launchpadmag.com/write/  

Launch Pad Magazine: Writers are welcome, but artists can also illustrate a student's work from on-line.

http://www.skippingstones.org/photosub.htm 

Skipping Stones:  Photographs and art with an ecological or cultural theme are welcome

http://www.stonesoup.com/stone-soup-contributor-guideline/  

Stone Soup:  stories, poems, book reviews, and art by young people through age 13

http://www.writingconference.com/submission_guidelines.htm 

The Writer's Slate:  They invite original poetry and prose from K-12-enrolled students, as well as pedagogical or creative writing by teachers.

http://www.zuzu.org/write.html  

Zuzu:

Got a groovy bulletin board, or place of honor in your room?    Send us a photo of the place where you express yourself, hang posters, stickers, whatever.

Are you a collector?  Send pictures of your entire collection or your most cherished piece, whether it's keychains or sports cards. And tell us a little about your collection, how you got started, etc.

Are you a fashion nut?  Send photos or drawings of your favorite designs, outfits or hairstyles.

Are you a budding Picasso or Georgia O'Keefe?   Send us artwork, either original drawings, or color xeroxes.

Computer art your thing?   Send us a disk with your latest animation or pixel painting.