PORTLAND — King Middle School will hold its annual Celebration of Learning from 9 a.m. to 2 p.m. Thursday at the Portland Exposition Building.

More than 500 students in grades 6 through 8 will display and explain educational projects developed through the school’s Expeditionary Learning curriculum. The public is invited. 

The event will coincide with the school’s annual Expeditionary Learning site seminar on Thursday and Friday, which is expected to attract about 100 teachers and principals from across the country.