Organizations that meet our program criteria and are interested in applying for our Official Charity Program may submit a Letter of Inquiry (LOI). All LOIs will be received and reviewed on a rolling basis. A LOI should be no more than one page in length and should not be submitted by an organization more than once per calendar year. Learn More Charities Boston Marathon How does an organization apply to be an official charity for the Boston Marathon. Use the Title for an admin friendly name so content authors can refer back to this FAQ item