Tick one or more people, or leave all unticked for Anyone. A shared task — whoever completes it first clears it for everyone.
Each slot is an open–close window (e.g. 10:00 – 12:00): the form can only be completed inside it. Leave empty for once per occurrence, any time that day.
Instead of the calendar, start this record when another form is submitted —
e.g. the verification opens 15 minutes after the dosing form is completed.
Setting a trigger form makes this schedule event-driven (its calendar frequency is ignored).