Comment 27 for bug 1879983

To clarify, there are at least two events that would need to be made active:

[1] Trigger curbside offer events and create a placeholder for the patron, where applicable (event def ID 111, hook hold.available) = create the placeholder appointments. This is on a 30-minute delay
[2] Curbside offer Email notification, triggered by CurbsideSlot reactor on a definition attached to the hold.available hook (event def 112, hook holds.offer_curbside) = send the actual offer notification

The first generates the events that trigger the second.