A name, a daily, weekly, or one-time cadence, and a point value awarded each time someone's logged as having done it. Managed entirely from the dashboard's Guild Roster → Activities view.

Logging normally happens by hand, one member at a time. But an activity can also be linked to a specific RSVP event type — once linked, completing that kind of event surfaces a "Confirm participation" checklist right on the dashboard, pre-checked with everyone who signed up (tentative signups excluded), so confirming is usually one click instead of logging each member individually. It stays open until confirmed — there's no time limit on it.