Alerts are an optional feature that can be set to remind invitees about an upcoming event. When an alert is set, invitees receive a device notification from Geo with a summary of the event details. Separately, if check-in is enabled for an event, invitees automatically receive a notification when the check-in window opens. Both notifications are posted on the Overview tab. For invitees to receive notifications outside of the app, their device settings must allow Geo to send notifications.