Schools with grades 4-8 are eligible to participate in the National Geographic Spelling Bee with a minimum of 6 participating students from the eligible grade levels. Homeschool Groups may collectively register as well. You can find out more info for homeschooling groups you can call them at 1 202 828 6659 or visit the website. There is a registration fee of U.S. $100 until October 15, after October 15 is $120. It needs to be accompanied by a note from the principal on a school letterhead but principals may designate a teacher in the school to be the recipient of the contest materials. For the mailing address and more details visit the National Geographic Geo Bee site!