Each morning I have consult times from 9-9:15, 9:15-9:30, 9:30-9:45, and 9:45-10:00

I have a team of 40 that can sign up for one of the available appointments, one for each time period.



Currently we're using a spreadsheet for sign ups.

I'd like to set up a calendar event, invite the group, but then when 1 person accepts the invitation, no one else can - "oops, this appointment is no longer available!"

I tried the group calendar thing, but that didn't seem to manage the appointment situation either.

Any ideas?