HackNEHS (Hack New England High Schools, pronounced Hack-ness) is a hackathon for high school students, organized by Phillips Academy students. Here's the poster: https://drive.google.com/file/d/1C9g1nnkrBDLatDj--Obil3lNGe7WivcN/view and this is the website: http://hacknehs.org/.
HackNEHS will take place in Burlington, MA, on October 12 from 8:00 am to 8:30 pm, and participants will have this time to solve a challenge. There will also be workshops throughout the event and keynote speakers before the events starts and after prizes handed out at the end.