From K1USN Happenings, January 12, 2023 (via ema.arrl.org):
Planning is well underway for the 2023 Boston Marathon! The BAA opened volunteer registration today and it will close on Friday, February 10, 2023. Returning volunteers should have received an email from the BAA with details about how to register.
New volunteers can sign up via http://register.hamradioboston.org/. We have also provided a step by step guide on how to select Amateur Radio volunteer positions during the registration process: <https://hamradioboston.freshdesk.com/support/solutions/articles/44002389087-2023-volunteer-registration-step-by-step-guide>.