During the last full weekend of July, we host the annual Knowles Summer Meeting. This three-day meeting, which is usually held in Philadelphia, is the official start of each Fellowship year. The Knowles Summer Meeting brings together community members—typically around 250 participants—to interact with, learn from and provide critical feedback to each other, within a variety of settings and structures. Five cohorts of Teaching Fellows attend the meeting, plus the cohort that is transitioning to Senior Fellow status, along with Senior Fellows who are engaged in specific activities related to the meeting (such as the Coaching Institute), staff and other experts in math and science education. Following the conclusion of this meeting, staff begins preparations for fall cohort meetings.