Each rehearsal has three answers: Going, Late and Can't make it. Tap one on the rehearsal and your leader sees it straight away. Change it any time before the rehearsal.
If your leader has marked you as Excused, you'll see that instead.
For leaders: taking attendance
Open the rehearsal in your choir's Rehearsals list and tap each name to mark who came: present, late, absent or excused. Harmny keeps an attendance rate for each member.
Rehearsal emails
Singers get an email when a rehearsal is added, changed or cancelled, and a reminder the day before. Turn these off under Me, then Email me about rehearsals.