> ## Documentation Index > Fetch the complete documentation index at: https://harnesscalendar.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Run a lesson > Take attendance and send notes; attendance creates the charges. After you teach, open the lesson on the calendar and do two things: mark attendance (which handles the billing) and send notes home. A minute per lesson. ## Mark attendance Open a saved lesson to see the controls, one row per student. * **Present** marks the lesson taught. When the lesson has a rate, this creates the charge at that rate. * **Absent** asks one follow-up when the lesson has a rate: **Charge** them anyway (your no-show policy) or **Waive** the charge. Charging a no-show is a per-lesson choice, never a policy you set once. * If the lesson has no rate, both are simple toggles and no money is involved. A paid lesson with no rate shows **no rate** on the row and charges nothing until you set one; see [Rate presets](/docs/settings/rate-presets). For a lesson with several students, use the bulk actions to mark everyone at once. Unmarking a student reverses their charge. That's the whole billing step: the charge lands on the student's account and rides its next invoice. See [Automated billing](/docs/billing/automated-billing). ## Add and send notes Write in the notes editor, then **Save** to keep the notes to yourself or **Send Notes** to email them out. After they go out, the button reads **Resend Notes** for sending an updated copy. Each student's notes go in one email to their **Lesson details** contacts: the student, a parent, or both. Set who's in that group on the student's profile; see [Contacts and notifications](/docs/students/contacts-and-notifications). ## FAQ Once the lesson is saved. Open a saved lesson from the calendar. The attendance controls and the notes editor appear in the lesson.