Register here: https://docs.google.com/forms/d/e/1FAIpQLSfRe1xiBKYaoKQlCy51avQ5iFjewPWMyVo8hycJ4tXxSeF4iA/viewform https://www.northreadingma.gov/calendar.aspx?EID=728
The organizer's page has the latest details, tickets and RSVP.